1261131060 has 96 divisors (see below), whose sum is σ = 4273032960. Its totient is φ = 271300608.

The previous prime is 1261131059. The next prime is 1261131089. The reversal of 1261131060 is 601311621.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81175 + ... + 95454.

It is an arithmetic number, because the mean of its divisors is an integer number (44510760).

Almost surely, 2^1261131060 is an apocalyptic number.

1261131060 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261131060 is an abundant number, since it is smaller than the sum of its proper divisors (3011901900).

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

1261131060 is a wasteful number, since it uses less digits than its factorization.

1261131060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176665 (or 176663 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1261131060 is about 35512.4071276505. The cubic root of 1261131060 is about 1080.4053862249.

Adding to 1261131060 its reverse (601311621), we get a palindrome (1862442681).

The spelling of 1261131060 in words is "one billion, two hundred sixty-one million, one hundred thirty-one thousand, sixty".