231072251 has 2 divisors, whose sum is σ = 231072252. Its totient is φ = 231072250.

The previous prime is 231072199. The next prime is 231072263. The reversal of 231072251 is 152270132.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231072251 - 2²² = 226877947 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231072271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115536125 + 115536126.

It is an arithmetic number, because the mean of its divisors is an integer number (115536126).

Almost surely, 2^231072251 is an apocalyptic number.

231072251 is a deficient number, since it is larger than the sum of its proper divisors (1).

231072251 is an equidigital number, since it uses as much as digits as its factorization.

231072251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 231072251 is about 15201.0608511380. The cubic root of 231072251 is about 613.6432080251.

The spelling of 231072251 in words is "two hundred thirty-one million, seventy-two thousand, two hundred fifty-one".