2156431431 has 16 divisors (see below), whose sum is σ = 3584717568. Its totient is φ = 1120224000.

The previous prime is 2156431411. The next prime is 2156431471. The reversal of 2156431431 is 1341346512.

It is not a de Polignac number, because 2156431431 - 2⁹ = 2156430919 is a prime.

It is a super-2 number, since 2×2156431431² = 9300393033209415522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156431411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4667370 + ... + 4667831.

It is an arithmetic number, because the mean of its divisors is an integer number (224044848).

Almost surely, 2^2156431431 is an apocalyptic number.

2156431431 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2156431431 is a deficient number, since it is larger than the sum of its proper divisors (1428286137).

2156431431 is a wasteful number, since it uses less digits than its factorization.

2156431431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9335222.

The product of its digits is 8640, while the sum is 30.

The square root of 2156431431 is about 46437.3925947614. The cubic root of 2156431431 is about 1291.9485467325.

Adding to 2156431431 its reverse (1341346512), we get a palindrome (3497777943).

The spelling of 2156431431 in words is "two billion, one hundred fifty-six million, four hundred thirty-one thousand, four hundred thirty-one".