63231989 has 2 divisors, whose sum is σ = 63231990. Its totient is φ = 63231988.

The previous prime is 63231983. The next prime is 63232003. The reversal of 63231989 is 98913236.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60575089 + 2656900 = 7783^2 + 1630^2 .

It is a cyclic number.

It is not a de Polignac number, because 63231989 - 2⁸ = 63231733 is a prime.

It is a super-2 number, since 2×63231989² = 7996568865792242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63231983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31615994 + 31615995.

It is an arithmetic number, because the mean of its divisors is an integer number (31615995).

Almost surely, 2^63231989 is an apocalyptic number.

It is an amenable number.

63231989 is a deficient number, since it is larger than the sum of its proper divisors (1).

63231989 is an equidigital number, since it uses as much as digits as its factorization.

63231989 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 63231989 is about 7951.8544378025. The cubic root of 63231989 is about 398.3935338871.

The spelling of 63231989 in words is "sixty-three million, two hundred thirty-one thousand, nine hundred eighty-nine".