51040215 has 24 divisors (see below), whose sum is σ = 88686000. Its totient is φ = 27154944.

The previous prime is 51040211. The next prime is 51040217. The reversal of 51040215 is 51204015.

It is not a de Polignac number, because 51040215 - 2² = 51040211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51040211) 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, 21319 + ... + 23591.

It is an arithmetic number, because the mean of its divisors is an integer number (3695250).

Almost surely, 2^51040215 is an apocalyptic number.

51040215 is a deficient number, since it is larger than the sum of its proper divisors (37645785).

51040215 is a wasteful number, since it uses less digits than its factorization.

51040215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2783 (or 2780 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 51040215 is about 7144.2434868921. The cubic root of 51040215 is about 370.9404248491.

The spelling of 51040215 in words is "fifty-one million, forty thousand, two hundred fifteen".