2157902431 has 2 divisors, whose sum is σ = 2157902432. Its totient is φ = 2157902430.

The previous prime is 2157902413. The next prime is 2157902437. The reversal of 2157902431 is 1342097512.

It is a happy number.

Together with previous prime (2157902413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2157902431 - 2¹⁹ = 2157378143 is a prime.

It is a super-2 number, since 2×2157902431² = 9313085803431419522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2157902437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078951215 + 1078951216.

It is an arithmetic number, because the mean of its divisors is an integer number (1078951216).

Almost surely, 2^2157902431 is an apocalyptic number.

2157902431 is a deficient number, since it is larger than the sum of its proper divisors (1).

2157902431 is an equidigital number, since it uses as much as digits as its factorization.

2157902431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 2157902431 is about 46453.2284238674. The cubic root of 2157902431 is about 1292.2422455906.

Adding to 2157902431 its reverse (1342097512), we get a palindrome (3499999943).

The spelling of 2157902431 in words is "two billion, one hundred fifty-seven million, nine hundred two thousand, four hundred thirty-one".