231573397 has 4 divisors (see below), whose sum is σ = 252625536. Its totient is φ = 210521260.

The previous prime is 231573383. The next prime is 231573401. The reversal of 231573397 is 793375132.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231573397 - 2¹¹ = 231571349 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 (231573347) 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, 10526053 + ... + 10526074.

It is an arithmetic number, because the mean of its divisors is an integer number (63156384).

Almost surely, 2^231573397 is an apocalyptic number.

It is an amenable number.

231573397 is a deficient number, since it is larger than the sum of its proper divisors (21052139).

231573397 is a wasteful number, since it uses less digits than its factorization.

231573397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21052138.

The product of its digits is 119070, while the sum is 40.

The square root of 231573397 is about 15217.5358386304. The cubic root of 231573397 is about 614.0865077389.

The spelling of 231573397 in words is "two hundred thirty-one million, five hundred seventy-three thousand, three hundred ninety-seven".