231303631 has 8 divisors (see below), whose sum is σ = 252815024. Its totient is φ = 210323520.

The previous prime is 231303629. The next prime is 231303647. The reversal of 231303631 is 136303132.

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 231303631 - 2¹ = 231303629 is a prime.

It is a super-2 number, since 2×231303631² = 107002739427568322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231303601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131910 + ... + 133651.

It is an arithmetic number, because the mean of its divisors is an integer number (31601878).

Almost surely, 2^231303631 is an apocalyptic number.

231303631 is a deficient number, since it is larger than the sum of its proper divisors (21511393).

231303631 is a wasteful number, since it uses less digits than its factorization.

231303631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265641.

The product of its (nonzero) digits is 972, while the sum is 22.

The square root of 231303631 is about 15208.6695999354. The cubic root of 231303631 is about 613.8479598576.

Adding to 231303631 its reverse (136303132), we get a palindrome (367606763).

The spelling of 231303631 in words is "two hundred thirty-one million, three hundred three thousand, six hundred thirty-one".