31029431 has 2 divisors, whose sum is σ = 31029432. Its totient is φ = 31029430.

The previous prime is 31029389. The next prime is 31029463. The reversal of 31029431 is 13492013.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31029431 is a prime.

It is a super-2 number, since 2×31029431² = 1925651176367522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 31029397 and 31029406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31029731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15514715 + 15514716.

It is an arithmetic number, because the mean of its divisors is an integer number (15514716).

Almost surely, 2^31029431 is an apocalyptic number.

31029431 is a deficient number, since it is larger than the sum of its proper divisors (1).

31029431 is an equidigital number, since it uses as much as digits as its factorization.

31029431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 31029431 is about 5570.4067176464. The cubic root of 31029431 is about 314.2374466705.

The spelling of 31029431 in words is "thirty-one million, twenty-nine thousand, four hundred thirty-one".