1309156956 has 18 divisors (see below), whose sum is σ = 3309257952. Its totient is φ = 436385640.

The previous prime is 1309156951. The next prime is 1309156963. The reversal of 1309156956 is 6596519031.

1309156956 is a `hidden beast` number, since 1 + 30 + 9 + 1 + 569 + 56 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309156951) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18182700 + ... + 18182771.

It is an arithmetic number, because the mean of its divisors is an integer number (183847664).

Almost surely, 2^1309156956 is an apocalyptic number.

It is an amenable number.

1309156956 is an abundant number, since it is smaller than the sum of its proper divisors (2000100996).

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

1309156956 is a wasteful number, since it uses less digits than its factorization.

1309156956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36365481 (or 36365476 counting only the distinct ones).

The product of its (nonzero) digits is 218700, while the sum is 45.

The square root of 1309156956 is about 36182.2740578864. The cubic root of 1309156956 is about 1093.9494120612.

The spelling of 1309156956 in words is "one billion, three hundred nine million, one hundred fifty-six thousand, nine hundred fifty-six".