2151431247 has 32 divisors (see below), whose sum is σ = 3426739200. Its totient is φ = 1173934080.

The previous prime is 2151431231. The next prime is 2151431257. The reversal of 2151431247 is 7421341512.

It is not a de Polignac number, because 2151431247 - 2⁴ = 2151431231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151431257) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 306129 + ... + 313077.

It is an arithmetic number, because the mean of its divisors is an integer number (107085600).

Almost surely, 2^2151431247 is an apocalyptic number.

2151431247 is a deficient number, since it is larger than the sum of its proper divisors (1275307953).

2151431247 is a wasteful number, since it uses less digits than its factorization.

2151431247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7623.

The product of its digits is 6720, while the sum is 30.

The square root of 2151431247 is about 46383.5234431366. The cubic root of 2151431247 is about 1290.9492136389.

Adding to 2151431247 its reverse (7421341512), we get a palindrome (9572772759).

The spelling of 2151431247 in words is "two billion, one hundred fifty-one million, four hundred thirty-one thousand, two hundred forty-seven".