2157444731 has 8 divisors (see below), whose sum is σ = 2324215824. Its totient is φ = 1990789920.

The previous prime is 2157444727. The next prime is 2157444743. The reversal of 2157444731 is 1374447512.

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

It is a cyclic number.

It is not a de Polignac number, because 2157444731 - 2² = 2157444727 is a prime.

It is a super-2 number, since 2×2157444731² = 9309135534639324722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2157444791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11585 + ... + 66701.

It is an arithmetic number, because the mean of its divisors is an integer number (290526978).

Almost surely, 2^2157444731 is an apocalyptic number.

2157444731 is a deficient number, since it is larger than the sum of its proper divisors (166771093).

2157444731 is a wasteful number, since it uses less digits than its factorization.

2157444731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58141.

The product of its digits is 94080, while the sum is 38.

The square root of 2157444731 is about 46448.3017019998. The cubic root of 2157444731 is about 1292.1508758281.

The spelling of 2157444731 in words is "two billion, one hundred fifty-seven million, four hundred forty-four thousand, seven hundred thirty-one".