231551071 has 4 divisors (see below), whose sum is σ = 231669592. Its totient is φ = 231432552.

The previous prime is 231551063. The next prime is 231551141. The reversal of 231551071 is 170155132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 231551071 - 2³ = 231551063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231551371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56280 + ... + 60253.

It is an arithmetic number, because the mean of its divisors is an integer number (57917398).

Almost surely, 2^231551071 is an apocalyptic number.

231551071 is a deficient number, since it is larger than the sum of its proper divisors (118521).

231551071 is a wasteful number, since it uses less digits than its factorization.

231551071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118520.

The product of its (nonzero) digits is 1050, while the sum is 25.

The square root of 231551071 is about 15216.8022593448. The cubic root of 231551071 is about 614.0667724035.

The spelling of 231551071 in words is "two hundred thirty-one million, five hundred fifty-one thousand, seventy-one".