231261251 has 16 divisors (see below), whose sum is σ = 275171904. Its totient is φ = 192175104.

The previous prime is 231261227. The next prime is 231261253. The reversal of 231261251 is 152162132.

It is a cyclic number.

It is not a de Polignac number, because 231261251 - 2¹⁸ = 230999107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231261253) 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, 17666 + ... + 27831.

It is an arithmetic number, because the mean of its divisors is an integer number (17198244).

Almost surely, 2^231261251 is an apocalyptic number.

231261251 is a deficient number, since it is larger than the sum of its proper divisors (43910653).

231261251 is a wasteful number, since it uses less digits than its factorization.

231261251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45550.

The product of its digits is 720, while the sum is 23.

The square root of 231261251 is about 15207.2762518473. The cubic root of 231261251 is about 613.8104673412.

The spelling of 231261251 in words is "two hundred thirty-one million, two hundred sixty-one thousand, two hundred fifty-one".