51616637 has 4 divisors (see below), whose sum is σ = 51650556. Its totient is φ = 51582720.

The previous prime is 51616583. The next prime is 51616667. The reversal of 51616637 is 73661615.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14394436 + 37222201 = 3794^2 + 6101^2 .

It is a cyclic number.

It is not a de Polignac number, because 51616637 - 2⁸ = 51616381 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51616597 and 51616606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51616667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14564 + ... + 17757.

It is an arithmetic number, because the mean of its divisors is an integer number (12912639).

Almost surely, 2^51616637 is an apocalyptic number.

It is an amenable number.

51616637 is a deficient number, since it is larger than the sum of its proper divisors (33919).

51616637 is a wasteful number, since it uses less digits than its factorization.

51616637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33918.

The product of its digits is 22680, while the sum is 35.

The square root of 51616637 is about 7184.4719360577. The cubic root of 51616637 is about 372.3316044401.

The spelling of 51616637 in words is "fifty-one million, six hundred sixteen thousand, six hundred thirty-seven".