51420215 has 16 divisors (see below), whose sum is σ = 76930560. Its totient is φ = 32053920.

The previous prime is 51420199. The next prime is 51420233. The reversal of 51420215 is 51202415.

It is not a de Polignac number, because 51420215 - 2⁴ = 51420199 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66395 + ... + 67164.

It is an arithmetic number, because the mean of its divisors is an integer number (4808160).

Almost surely, 2^51420215 is an apocalyptic number.

51420215 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51420215 is a deficient number, since it is larger than the sum of its proper divisors (25510345).

51420215 is a wasteful number, since it uses less digits than its factorization.

51420215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133582.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 51420215 is about 7170.7890081915. The cubic root of 51420215 is about 371.8587137372.

The spelling of 51420215 in words is "fifty-one million, four hundred twenty thousand, two hundred fifteen".