231294721 has 16 divisors (see below), whose sum is σ = 271473664. Its totient is φ = 192934224.

The previous prime is 231294683. The next prime is 231294727. The reversal of 231294721 is 127492132.

It is not a de Polignac number, because 231294721 - 2⁹ = 231294209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231294727) 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, 91156 + ... + 93658.

It is an arithmetic number, because the mean of its divisors is an integer number (16967104).

Almost surely, 2^231294721 is an apocalyptic number.

It is an amenable number.

231294721 is a deficient number, since it is larger than the sum of its proper divisors (40178943).

231294721 is a wasteful number, since it uses less digits than its factorization.

231294721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2860.

The product of its digits is 6048, while the sum is 31.

The square root of 231294721 is about 15208.3766720844. The cubic root of 231294721 is about 613.8400777857.

The spelling of 231294721 in words is "two hundred thirty-one million, two hundred ninety-four thousand, seven hundred twenty-one".