1261313232 has 80 divisors (see below), whose sum is σ = 3480848640. Its totient is φ = 392175616.

The previous prime is 1261313231. The next prime is 1261313237. The reversal of 1261313232 is 2323131621.

It is a super-2 number, since 2×1261313232² = 3181822138436571648, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261313231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85369 + ... + 99047.

It is an arithmetic number, because the mean of its divisors is an integer number (43510608).

Almost surely, 2^1261313232 is an apocalyptic number.

1261313232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1261313232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1740424320).

1261313232 is an abundant number, since it is smaller than the sum of its proper divisors (2219535408).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1261313232 is a wasteful number, since it uses less digits than its factorization.

1261313232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13820 (or 13814 counting only the distinct ones).

The product of its digits is 1296, while the sum is 24.

The square root of 1261313232 is about 35514.9719414221. The cubic root of 1261313232 is about 1080.4574057018.

Adding to 1261313232 its reverse (2323131621), we get a palindrome (3584444853).

The spelling of 1261313232 in words is "one billion, two hundred sixty-one million, three hundred thirteen thousand, two hundred thirty-two".