231401431 has 2 divisors, whose sum is σ = 231401432. Its totient is φ = 231401430.

The previous prime is 231401407. The next prime is 231401449. The reversal of 231401431 is 134104132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231401431 - 2²⁷ = 97183703 is a prime.

It is a super-2 number, since 2×231401431² = 107093244537695522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231401399 and 231401408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231401231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115700715 + 115700716.

It is an arithmetic number, because the mean of its divisors is an integer number (115700716).

Almost surely, 2^231401431 is an apocalyptic number.

231401431 is a deficient number, since it is larger than the sum of its proper divisors (1).

231401431 is an equidigital number, since it uses as much as digits as its factorization.

231401431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 231401431 is about 15211.8845315102. The cubic root of 231401431 is about 613.9344635742.

Adding to 231401431 its reverse (134104132), we get a palindrome (365505563).

The spelling of 231401431 in words is "two hundred thirty-one million, four hundred one thousand, four hundred thirty-one".