231721894 has 16 divisors (see below), whose sum is σ = 350277120. Its totient is φ = 114966720.

The previous prime is 231721879. The next prime is 231721921. The reversal of 231721894 is 498127132.

It is a congruent 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, 174754 + ... + 176074.

It is an arithmetic number, because the mean of its divisors is an integer number (21892320).

Almost surely, 2^231721894 is an apocalyptic number.

231721894 is a deficient number, since it is larger than the sum of its proper divisors (118555226).

231721894 is a wasteful number, since it uses less digits than its factorization.

231721894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1935.

The product of its digits is 24192, while the sum is 37.

The square root of 231721894 is about 15222.4141974918. The cubic root of 231721894 is about 614.2177411769.

The spelling of 231721894 in words is "two hundred thirty-one million, seven hundred twenty-one thousand, eight hundred ninety-four".