51555597 has 8 divisors (see below), whose sum is σ = 69449856. Its totient is φ = 34015872.

The previous prime is 51555589. The next prime is 51555601. The reversal of 51555597 is 79555515.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51555597 - 2³ = 51555589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51555587) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88293 + ... + 88874.

It is an arithmetic number, because the mean of its divisors is an integer number (8681232).

Almost surely, 2^51555597 is an apocalyptic number.

It is an amenable number.

51555597 is a deficient number, since it is larger than the sum of its proper divisors (17894259).

51555597 is a wasteful number, since it uses less digits than its factorization.

51555597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177267.

The product of its digits is 196875, while the sum is 42.

The square root of 51555597 is about 7180.2226288605. Note that the first 3 decimals coincide. The cubic root of 51555597 is about 372.1847778411.

The spelling of 51555597 in words is "fifty-one million, five hundred fifty-five thousand, five hundred ninety-seven".