51608605 has 4 divisors (see below), whose sum is σ = 61930332. Its totient is φ = 41286880.

The previous prime is 51608597. The next prime is 51608621. The reversal of 51608605 is 50680615.

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 15163236 + 36445369 = 3894^2 + 6037^2 .

It is not a de Polignac number, because 51608605 - 2³ = 51608597 is a prime.

It is a super-2 number, since 2×51608605² = 5326896220092050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5160856 + ... + 5160865.

It is an arithmetic number, because the mean of its divisors is an integer number (15482583).

Almost surely, 2^51608605 is an apocalyptic number.

It is an amenable number.

51608605 is a deficient number, since it is larger than the sum of its proper divisors (10321727).

51608605 is a wasteful number, since it uses less digits than its factorization.

51608605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10321726.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 51608605 is about 7183.9129309868. The cubic root of 51608605 is about 372.3122907539.

The spelling of 51608605 in words is "fifty-one million, six hundred eight thousand, six hundred five".