231971578705 has 8 divisors (see below), whose sum is σ = 278378284392. Its totient is φ = 185569003008.

The previous prime is 231971578697. The next prime is 231971578733. The reversal of 231971578705 is 507875179132.

It can be written as a sum of positive squares in 4 ways, for example, as 20481044544 + 211490534161 = 143112^2 + 459881^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231971578705 - 2³ = 231971578697 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 907552 + ... + 1134721.

It is an arithmetic number, because the mean of its divisors is an integer number (34797285549).

Almost surely, 2^231971578705 is an apocalyptic number.

It is an amenable number.

231971578705 is a deficient number, since it is larger than the sum of its proper divisors (46406705687).

231971578705 is a wasteful number, since it uses less digits than its factorization.

231971578705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2064995.

The product of its (nonzero) digits is 3704400, while the sum is 55.

The spelling of 231971578705 in words is "two hundred thirty-one billion, nine hundred seventy-one million, five hundred seventy-eight thousand, seven hundred five".