231404331 has 16 divisors (see below), whose sum is σ = 311205888. Its totient is φ = 152942400.

The previous prime is 231404317. The next prime is 231404339. The reversal of 231404331 is 133404132.

It is not a de Polignac number, because 231404331 - 2¹⁸ = 231142187 is a prime.

It is a super-2 number, since 2×231404331² = 107095928811115122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231404298 and 231404307.

It is not an unprimeable number, because it can be changed into a prime (231404339) 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 15 ways as a sum of consecutive naturals, for example, 246495 + ... + 247431.

It is an arithmetic number, because the mean of its divisors is an integer number (19450368).

Almost surely, 2^231404331 is an apocalyptic number.

231404331 is a deficient number, since it is larger than the sum of its proper divisors (79801557).

231404331 is a wasteful number, since it uses less digits than its factorization.

231404331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 231404331 is about 15211.9798514197. The cubic root of 231404331 is about 613.9370282407.

Adding to 231404331 its reverse (133404132), we get a palindrome (364808463).

The spelling of 231404331 in words is "two hundred thirty-one million, four hundred four thousand, three hundred thirty-one".