31230431 has 2 divisors, whose sum is σ = 31230432. Its totient is φ = 31230430.

The previous prime is 31230421. The next prime is 31230439. The reversal of 31230431 is 13403213.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31230431 is a prime.

It is a super-2 number, since 2×31230431² = 1950679640891522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31230439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615215 + 15615216.

It is an arithmetic number, because the mean of its divisors is an integer number (15615216).

Almost surely, 2^31230431 is an apocalyptic number.

31230431 is a deficient number, since it is larger than the sum of its proper divisors (1).

31230431 is an equidigital number, since it uses as much as digits as its factorization.

31230431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 31230431 is about 5588.4193650799. The cubic root of 31230431 is about 314.9145010250.

Adding to 31230431 its reverse (13403213), we get a palindrome (44633644).

The spelling of 31230431 in words is "thirty-one million, two hundred thirty thousand, four hundred thirty-one".