231208502158 has 4 divisors (see below), whose sum is σ = 346812753240. Its totient is φ = 115604251078.

The previous prime is 231208502153. The next prime is 231208502209. The reversal of 231208502158 is 851205802132.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231208502153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57802125538 + ... + 57802125541.

It is an arithmetic number, because the mean of its divisors is an integer number (86703188310).

Almost surely, 2^231208502158 is an apocalyptic number.

231208502158 is a deficient number, since it is larger than the sum of its proper divisors (115604251082).

231208502158 is a wasteful number, since it uses less digits than its factorization.

231208502158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115604251081.

The product of its (nonzero) digits is 38400, while the sum is 37.

The spelling of 231208502158 in words is "two hundred thirty-one billion, two hundred eight million, five hundred two thousand, one hundred fifty-eight".