51155559 has 36 divisors (see below), whose sum is σ = 92577576. Its totient is φ = 26980128.

The previous prime is 51155551. The next prime is 51155561. The reversal of 51155559 is 95555115.

It is a happy number.

51155559 is a `hidden beast` number, since 51 + 1 + 55 + 559 = 666.

It is not a de Polignac number, because 51155559 - 2³ = 51155551 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51155551) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1272 + ... + 10194.

Almost surely, 2^51155559 is an apocalyptic number.

51155559 is a deficient number, since it is larger than the sum of its proper divisors (41422017).

51155559 is a wasteful number, since it uses less digits than its factorization.

51155559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8956 (or 8946 counting only the distinct ones).

The product of its digits is 28125, while the sum is 36.

The square root of 51155559 is about 7152.3114445611. The cubic root of 51155559 is about 371.2196397306.

The spelling of 51155559 in words is "fifty-one million, one hundred fifty-five thousand, five hundred fifty-nine".