1051172865 has 24 divisors (see below), whose sum is σ = 1828981440. Its totient is φ = 558487584.

The previous prime is 1051172861. The next prime is 1051172867. The reversal of 1051172865 is 5682711501.

1051172865 is a `hidden beast` number, since 10 + 511 + 72 + 8 + 65 = 666.

It is not a de Polignac number, because 1051172865 - 2² = 1051172861 is a prime.

It is a super-2 number, since 2×1051172865² = 2209928784224616450, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1051172861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32575 + ... + 56244.

It is an arithmetic number, because the mean of its divisors is an integer number (76207560).

Almost surely, 2^1051172865 is an apocalyptic number.

1051172865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1051172865 is a deficient number, since it is larger than the sum of its proper divisors (777808575).

1051172865 is a wasteful number, since it uses less digits than its factorization.

1051172865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89093 (or 89090 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 36.

The square root of 1051172865 is about 32421.7961408680. The cubic root of 1051172865 is about 1016.7746590770.

The spelling of 1051172865 in words is "one billion, fifty-one million, one hundred seventy-two thousand, eight hundred sixty-five".