51639577 has 16 divisors (see below), whose sum is σ = 59045760. Its totient is φ = 44704000.

The previous prime is 51639571. The next prime is 51639589. The reversal of 51639577 is 77593615.

It is not a de Polignac number, because 51639577 - 2³ = 51639569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51639571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101199 + ... + 101707.

It is an arithmetic number, because the mean of its divisors is an integer number (3690360).

Almost surely, 2^51639577 is an apocalyptic number.

It is an amenable number.

51639577 is a deficient number, since it is larger than the sum of its proper divisors (7406183).

51639577 is a wasteful number, since it uses less digits than its factorization.

51639577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 944.

The product of its digits is 198450, while the sum is 43.

The square root of 51639577 is about 7186.0682573992. The cubic root of 51639577 is about 372.3867547590.

The spelling of 51639577 in words is "fifty-one million, six hundred thirty-nine thousand, five hundred seventy-seven".