51551605 has 16 divisors (see below), whose sum is σ = 72981504. Its totient is φ = 34208640.

The previous prime is 51551573. The next prime is 51551611. The reversal of 51551605 is 50615515.

It is not a de Polignac number, because 51551605 - 2⁵ = 51551573 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 22672 + ... + 24841.

It is an arithmetic number, because the mean of its divisors is an integer number (4561344).

Almost surely, 2^51551605 is an apocalyptic number.

It is an amenable number.

51551605 is a deficient number, since it is larger than the sum of its proper divisors (21429899).

51551605 is a wasteful number, since it uses less digits than its factorization.

51551605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47556.

The product of its (nonzero) digits is 3750, while the sum is 28.

The square root of 51551605 is about 7179.9446376696. The cubic root of 51551605 is about 372.1751713834.

The spelling of 51551605 in words is "fifty-one million, five hundred fifty-one thousand, six hundred five".