639097151 has 32 divisors (see below), whose sum is σ = 820800000. Its totient is φ = 493261440.

The previous prime is 639097141. The next prime is 639097177. The reversal of 639097151 is 151790936.

It is a de Polignac number, because none of the positive numbers 2^k-639097151 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 639097099 and 639097108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639097111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 425600 + ... + 427098.

It is an arithmetic number, because the mean of its divisors is an integer number (25650000).

Almost surely, 2^639097151 is an apocalyptic number.

639097151 is a deficient number, since it is larger than the sum of its proper divisors (181702849).

639097151 is a wasteful number, since it uses less digits than its factorization.

639097151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1644 (or 1630 counting only the distinct ones).

The product of its (nonzero) digits is 51030, while the sum is 41.

The square root of 639097151 is about 25280.3708635771. The cubic root of 639097151 is about 861.3684500568.

The spelling of 639097151 in words is "six hundred thirty-nine million, ninety-seven thousand, one hundred fifty-one".