31242931 has 2 divisors, whose sum is σ = 31242932. Its totient is φ = 31242930.

The previous prime is 31242907. The next prime is 31242949. The reversal of 31242931 is 13924213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31242931 - 2⁵ = 31242899 is a prime.

It is a super-2 number, since 2×31242931² = 1952241474941522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31242896 and 31242905.

It is not a weakly prime, because it can be changed into another prime (31242961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15621465 + 15621466.

It is an arithmetic number, because the mean of its divisors is an integer number (15621466).

Almost surely, 2^31242931 is an apocalyptic number.

31242931 is a deficient number, since it is larger than the sum of its proper divisors (1).

31242931 is an equidigital number, since it uses as much as digits as its factorization.

31242931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 25.

The square root of 31242931 is about 5589.5376374079. The cubic root of 31242931 is about 314.9565103309.

The spelling of 31242931 in words is "thirty-one million, two hundred forty-two thousand, nine hundred thirty-one".