31242851 has 2 divisors, whose sum is σ = 31242852. Its totient is φ = 31242850.

The previous prime is 31242833. The next prime is 31242863. The reversal of 31242851 is 15824213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31242851 - 2¹⁰ = 31241827 is a prime.

It is a super-2 number, since 2×31242851² = 1952231477216402, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31242851.

It is not a weakly prime, because it can be changed into another prime (31242881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15621425 + 15621426.

It is an arithmetic number, because the mean of its divisors is an integer number (15621426).

Almost surely, 2^31242851 is an apocalyptic number.

31242851 is a deficient number, since it is larger than the sum of its proper divisors (1).

31242851 is an equidigital number, since it uses as much as digits as its factorization.

31242851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 26.

The square root of 31242851 is about 5589.5304811764. The cubic root of 31242851 is about 314.9562415070.

The spelling of 31242851 in words is "thirty-one million, two hundred forty-two thousand, eight hundred fifty-one".