631033189 has 2 divisors, whose sum is σ = 631033190. Its totient is φ = 631033188.

The previous prime is 631033181. The next prime is 631033219. The reversal of 631033189 is 981330136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 412496100 + 218537089 = 20310^2 + 14783^2 .

It is a cyclic number.

It is not a de Polignac number, because 631033189 - 2³ = 631033181 is a prime.

It is equal to p_32858125 and since 631033189 and 32858125 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631033181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315516594 + 315516595.

It is an arithmetic number, because the mean of its divisors is an integer number (315516595).

Almost surely, 2^631033189 is an apocalyptic number.

It is an amenable number.

631033189 is a deficient number, since it is larger than the sum of its proper divisors (1).

631033189 is an equidigital number, since it uses as much as digits as its factorization.

631033189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 631033189 is about 25120.3739820887. The cubic root of 631033189 is about 857.7302637915.

The spelling of 631033189 in words is "six hundred thirty-one million, thirty-three thousand, one hundred eighty-nine".