1156911885 has 12 divisors (see below), whose sum is σ = 2005314012. Its totient is φ = 617019648.

The previous prime is 1156911869. The next prime is 1156911907. The reversal of 1156911885 is 5881196511.

1156911885 is a `hidden beast` number, since 1 + 1 + 569 + 1 + 1 + 8 + 85 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 802192329 + 354719556 = 28323^2 + 18834^2 .

It is not a de Polignac number, because 1156911885 - 2⁴ = 1156911869 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 25709153 = 1156911885 / (1 + 1 + 5 + 6 + 9 + 1 + 1 + 8 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 1156911885.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12854532 + ... + 12854621.

It is an arithmetic number, because the mean of its divisors is an integer number (167109501).

Almost surely, 2^1156911885 is an apocalyptic number.

1156911885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1156911885 is a deficient number, since it is larger than the sum of its proper divisors (848402127).

1156911885 is a wasteful number, since it uses less digits than its factorization.

1156911885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25709164 (or 25709161 counting only the distinct ones).

The product of its digits is 86400, while the sum is 45.

The square root of 1156911885 is about 34013.4074300121. The cubic root of 1156911885 is about 1049.7843502706.

The spelling of 1156911885 in words is "one billion, one hundred fifty-six million, nine hundred eleven thousand, eight hundred eighty-five".