2156851631 has 8 divisors (see below), whose sum is σ = 2353400400. Its totient is φ = 1960381440.

The previous prime is 2156851559. The next prime is 2156851637. The reversal of 2156851631 is 1361586512.

2156851631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2156851631 is a prime.

It is a super-2 number, since 2×2156851631² = 9304017916294720322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156851637) 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, 47855 + ... + 81263.

It is an arithmetic number, because the mean of its divisors is an integer number (294175050).

Almost surely, 2^2156851631 is an apocalyptic number.

2156851631 is a deficient number, since it is larger than the sum of its proper divisors (196548769).

2156851631 is a wasteful number, since it uses less digits than its factorization.

2156851631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39289.

The product of its digits is 43200, while the sum is 38.

The square root of 2156851631 is about 46441.9167455436. The cubic root of 2156851631 is about 1292.0324572020.

The spelling of 2156851631 in words is "two billion, one hundred fifty-six million, eight hundred fifty-one thousand, six hundred thirty-one".