231315977730 has 32 divisors (see below), whose sum is σ = 565633036224. Its totient is φ = 60520406336.

The previous prime is 231315977719. The next prime is 231315977731. The reversal of 231315977730 is 37779513132.

It is a self number, because there is not a number n which added to its sum of digits gives 231315977730.

It is not an unprimeable number, because it can be changed into a prime (231315977731) 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, 72739284 + ... + 72742463.

It is an arithmetic number, because the mean of its divisors is an integer number (17676032382).

Almost surely, 2^231315977730 is an apocalyptic number.

231315977730 is an abundant number, since it is smaller than the sum of its proper divisors (334317058494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231315977730 is a wasteful number, since it uses less digits than its factorization.

231315977730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145481810.

The product of its (nonzero) digits is 833490, while the sum is 48.

The spelling of 231315977730 in words is "two hundred thirty-one billion, three hundred fifteen million, nine hundred seventy-seven thousand, seven hundred thirty".