1261322412 has 48 divisors (see below), whose sum is σ = 3561384960. Its totient is φ = 339178752.

The previous prime is 1261322411. The next prime is 1261322431. The reversal of 1261322412 is 2142231621.

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

It is not an unprimeable number, because it can be changed into a prime (1261322411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 440212 + ... + 443067.

It is an arithmetic number, because the mean of its divisors is an integer number (74195520).

Almost surely, 2^1261322412 is an apocalyptic number.

1261322412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1261322412 is an abundant number, since it is smaller than the sum of its proper divisors (2300062548).

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

1261322412 is a wasteful number, since it uses less digits than its factorization.

1261322412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883310 (or 883308 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 1261322412 is about 35515.1011824548. The cubic root of 1261322412 is about 1080.4600269314.

The spelling of 1261322412 in words is "one billion, two hundred sixty-one million, three hundred twenty-two thousand, four hundred twelve".