2157431437 has 12 divisors (see below), whose sum is σ = 2641753920. Its totient is φ = 1751898456.

The previous prime is 2157431431. The next prime is 2157431449. The reversal of 2157431437 is 7341347512.

It is not a de Polignac number, because 2157431437 - 2³ = 2157431429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2157431396 and 2157431405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157431431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1157733 + ... + 1159594.

It is an arithmetic number, because the mean of its divisors is an integer number (220146160).

Almost surely, 2^2157431437 is an apocalyptic number.

It is an amenable number.

2157431437 is a deficient number, since it is larger than the sum of its proper divisors (484322483).

2157431437 is a wasteful number, since it uses less digits than its factorization.

2157431437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2317360 (or 2317353 counting only the distinct ones).

The product of its digits is 70560, while the sum is 37.

The square root of 2157431437 is about 46448.1585964395. The cubic root of 2157431437 is about 1292.1482217796.

Adding to 2157431437 its reverse (7341347512), we get a palindrome (9498778949).

The spelling of 2157431437 in words is "two billion, one hundred fifty-seven million, four hundred thirty-one thousand, four hundred thirty-seven".