51951555 has 24 divisors (see below), whose sum is σ = 90305280. Its totient is φ = 27628800.

The previous prime is 51951539. The next prime is 51951563. The reversal of 51951555 is 55515915.

It is a happy number.

51951555 is a `hidden beast` number, since 51 + 9 + 51 + 555 = 666.

It is not a de Polignac number, because 51951555 - 2⁴ = 51951539 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16606 + ... + 19484.

It is an arithmetic number, because the mean of its divisors is an integer number (3762720).

Almost surely, 2^51951555 is an apocalyptic number.

51951555 is a deficient number, since it is larger than the sum of its proper divisors (38353725).

51951555 is a wasteful number, since it uses less digits than its factorization.

51951555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3291 (or 3288 counting only the distinct ones).

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

The square root of 51951555 is about 7207.7427118343. The cubic root of 51951555 is about 373.1351684476.

The spelling of 51951555 in words is "fifty-one million, nine hundred fifty-one thousand, five hundred fifty-five".