1261581772 has 12 divisors (see below), whose sum is σ = 2408474376. Its totient is φ = 573446240.

The previous prime is 1261581757. The next prime is 1261581787. The reversal of 1261581772 is 2771851621.

It is an interprime number because it is at equal distance from previous prime (1261581757) and next prime (1261581787).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14336113 + ... + 14336200.

It is an arithmetic number, because the mean of its divisors is an integer number (200706198).

Almost surely, 2^1261581772 is an apocalyptic number.

It is an amenable number.

1261581772 is a deficient number, since it is larger than the sum of its proper divisors (1146892604).

1261581772 is a wasteful number, since it uses less digits than its factorization.

1261581772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28672328 (or 28672326 counting only the distinct ones).

The product of its digits is 47040, while the sum is 40.

The square root of 1261581772 is about 35518.7523992609. The cubic root of 1261581772 is about 1080.5340785524.

The spelling of 1261581772 in words is "one billion, two hundred sixty-one million, five hundred eighty-one thousand, seven hundred seventy-two".