2156772831 has 8 divisors (see below), whose sum is σ = 2929955760. Its totient is φ = 1410719232.

The previous prime is 2156772829. The next prime is 2156772841. The reversal of 2156772831 is 1382776512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2156772831 - 2¹ = 2156772829 is a prime.

It is a super-2 number, since 2×2156772831² = 9303338089079509122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156772811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6782146 + ... + 6782463.

It is an arithmetic number, because the mean of its divisors is an integer number (366244470).

Almost surely, 2^2156772831 is an apocalyptic number.

2156772831 is a deficient number, since it is larger than the sum of its proper divisors (773182929).

2156772831 is a wasteful number, since it uses less digits than its factorization.

2156772831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13564665.

The product of its digits is 141120, while the sum is 42.

The square root of 2156772831 is about 46441.0683662639. The cubic root of 2156772831 is about 1292.0167223232.

The spelling of 2156772831 in words is "two billion, one hundred fifty-six million, seven hundred seventy-two thousand, eight hundred thirty-one".