231256605 has 32 divisors (see below), whose sum is σ = 395539200. Its totient is φ = 115089920.

The previous prime is 231256603. The next prime is 231256631. The reversal of 231256605 is 506652132.

231256605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 231256605 - 2¹ = 231256603 is a prime.

It is a super-2 number, since 2×231256605² = 106959234712252050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231256603) 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, 5971 + ... + 22319.

It is an arithmetic number, because the mean of its divisors is an integer number (12360600).

Almost surely, 2^231256605 is an apocalyptic number.

It is an amenable number.

231256605 is a deficient number, since it is larger than the sum of its proper divisors (164282595).

231256605 is a wasteful number, since it uses less digits than its factorization.

231256605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16421.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 231256605 is about 15207.1234952571. The cubic root of 231256605 is about 613.8063568637.

The spelling of 231256605 in words is "two hundred thirty-one million, two hundred fifty-six thousand, six hundred five".