31872851 has 2 divisors, whose sum is σ = 31872852. Its totient is φ = 31872850.

The previous prime is 31872829. The next prime is 31872853. The reversal of 31872851 is 15827813.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31872851 - 2¹⁸ = 31610707 is a prime.

It is a super-3 number, since 3×31872851³ (a number of 23 digits) contains 333 as substring.

Together with 31872853, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31872853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15936425 + 15936426.

It is an arithmetic number, because the mean of its divisors is an integer number (15936426).

Almost surely, 2^31872851 is an apocalyptic number.

31872851 is a deficient number, since it is larger than the sum of its proper divisors (1).

31872851 is an equidigital number, since it uses as much as digits as its factorization.

31872851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 35.

The square root of 31872851 is about 5645.6045734713. The cubic root of 31872851 is about 317.0591596142.

It can be divided in two parts, 31872 and 851, that added together give a palindrome (32723).

The spelling of 31872851 in words is "thirty-one million, eight hundred seventy-two thousand, eight hundred fifty-one".