31222987 has 2 divisors, whose sum is σ = 31222988. Its totient is φ = 31222986.

The previous prime is 31222981. The next prime is 31222991. The reversal of 31222987 is 78922213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31222987 - 2¹⁵ = 31190219 is a prime.

It is not a weakly prime, because it can be changed into another prime (31222981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15611493 + 15611494.

It is an arithmetic number, because the mean of its divisors is an integer number (15611494).

Almost surely, 2^31222987 is an apocalyptic number.

31222987 is a deficient number, since it is larger than the sum of its proper divisors (1).

31222987 is an equidigital number, since it uses as much as digits as its factorization.

31222987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

The square root of 31222987 is about 5587.7533052203. The cubic root of 31222987 is about 314.8894783174.

The spelling of 31222987 in words is "thirty-one million, two hundred twenty-two thousand, nine hundred eighty-seven".