231401644 has 12 divisors (see below), whose sum is σ = 405312768. Its totient is φ = 115598000.

The previous prime is 231401591. The next prime is 231401699. The reversal of 231401644 is 446104132.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20527 + ... + 29734.

It is an arithmetic number, because the mean of its divisors is an integer number (33776064).

Almost surely, 2^231401644 is an apocalyptic number.

It is an amenable number.

231401644 is a deficient number, since it is larger than the sum of its proper divisors (173911124).

231401644 is a wasteful number, since it uses less digits than its factorization.

231401644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51416 (or 51414 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 231401644 is about 15211.8915326136. The cubic root of 231401644 is about 613.9346519453.

Adding to 231401644 its reverse (446104132), we get a palindrome (677505776).

The spelling of 231401644 in words is "two hundred thirty-one million, four hundred one thousand, six hundred forty-four".