51555311 has 8 divisors (see below), whose sum is σ = 52276224. Its totient is φ = 50838840.

The previous prime is 51555307. The next prime is 51555347. The reversal of 51555311 is 11355515.

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

It is a cyclic number.

It is not a de Polignac number, because 51555311 - 2² = 51555307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51554311) 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, 26990 + ... + 28836.

It is an arithmetic number, because the mean of its divisors is an integer number (6534528).

Almost surely, 2^51555311 is an apocalyptic number.

51555311 is a deficient number, since it is larger than the sum of its proper divisors (720913).

51555311 is a wasteful number, since it uses less digits than its factorization.

51555311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2221.

The product of its digits is 1875, while the sum is 26.

The square root of 51555311 is about 7180.2027130158. The cubic root of 51555311 is about 372.1840896193.

The spelling of 51555311 in words is "fifty-one million, five hundred fifty-five thousand, three hundred eleven".