645031124 has 6 divisors (see below), whose sum is σ = 1128804474. Its totient is φ = 322515560.

The previous prime is 645031117. The next prime is 645031151. The reversal of 645031124 is 421130546.

It can be written as a sum of positive squares in only one way, i.e., 550747024 + 94284100 = 23468^2 + 9710^2 .

It is a junction number, because it is equal to n+sod(n) for n = 645031093 and 645031102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80628887 + ... + 80628894.

It is an arithmetic number, because the mean of its divisors is an integer number (188134079).

Almost surely, 2^645031124 is an apocalyptic number.

It is an amenable number.

645031124 is a deficient number, since it is larger than the sum of its proper divisors (483773350).

645031124 is a wasteful number, since it uses less digits than its factorization.

645031124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161257785 (or 161257783 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 645031124 is about 25397.4629441604. The cubic root of 645031124 is about 864.0261569727.

The spelling of 645031124 in words is "six hundred forty-five million, thirty-one thousand, one hundred twenty-four".