31263989 has 2 divisors, whose sum is σ = 31263990. Its totient is φ = 31263988.

The previous prime is 31263983. The next prime is 31263997. The reversal of 31263989 is 98936213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24581764 + 6682225 = 4958^2 + 2585^2 .

It is a cyclic number.

It is not a de Polignac number, because 31263989 - 2⁸ = 31263733 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31263983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15631994 + 15631995.

It is an arithmetic number, because the mean of its divisors is an integer number (15631995).

Almost surely, 2^31263989 is an apocalyptic number.

It is an amenable number.

31263989 is a deficient number, since it is larger than the sum of its proper divisors (1).

31263989 is an equidigital number, since it uses as much as digits as its factorization.

31263989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 41.

The square root of 31263989 is about 5591.4210179524. The cubic root of 31263989 is about 315.0272555571.

The spelling of 31263989 in words is "thirty-one million, two hundred sixty-three thousand, nine hundred eighty-nine".