51242155 has 8 divisors (see below), whose sum is σ = 61561584. Its totient is φ = 40946400.

The previous prime is 51242141. The next prime is 51242167. The reversal of 51242155 is 55124215.

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

It is not a de Polignac number, because 51242155 - 2⁵ = 51242123 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 741 + ... + 10150.

It is an arithmetic number, because the mean of its divisors is an integer number (7695198).

Almost surely, 2^51242155 is an apocalyptic number.

51242155 is a deficient number, since it is larger than the sum of its proper divisors (10319429).

51242155 is a wasteful number, since it uses less digits than its factorization.

51242155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11837.

The product of its digits is 2000, while the sum is 25.

The square root of 51242155 is about 7158.3625921016. The cubic root of 51242155 is about 371.4289882004.

The spelling of 51242155 in words is "fifty-one million, two hundred forty-two thousand, one hundred fifty-five".