1156091856 has 20 divisors (see below), whose sum is σ = 2986570752. Its totient is φ = 385363936.

The previous prime is 1156091837. The next prime is 1156091857. The reversal of 1156091856 is 6581906511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156091857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12042576 + ... + 12042671.

Almost surely, 2^1156091856 is an apocalyptic number.

1156091856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1156091856 is an abundant number, since it is smaller than the sum of its proper divisors (1830478896).

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

1156091856 is a wasteful number, since it uses less digits than its factorization.

1156091856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24085258 (or 24085252 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 42.

The square root of 1156091856 is about 34001.3507966963. The cubic root of 1156091856 is about 1049.5362596148.

The spelling of 1156091856 in words is "one billion, one hundred fifty-six million, ninety-one thousand, eight hundred fifty-six".