51011205 has 24 divisors (see below), whose sum is σ = 94944672. Its totient is φ = 23319072.

The previous prime is 51011183. The next prime is 51011209. The reversal of 51011205 is 50211015.

It is not a de Polignac number, because 51011205 - 2⁶ = 51011141 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51011209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33967 + ... + 35436.

It is an arithmetic number, because the mean of its divisors is an integer number (3956028).

Almost surely, 2^51011205 is an apocalyptic number.

It is an amenable number.

51011205 is a deficient number, since it is larger than the sum of its proper divisors (43933467).

51011205 is a wasteful number, since it uses less digits than its factorization.

51011205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69425 (or 69418 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 15.

The square root of 51011205 is about 7142.2128923745. The cubic root of 51011205 is about 370.8701337324.

The spelling of 51011205 in words is "fifty-one million, eleven thousand, two hundred five".