51216015 has 8 divisors (see below), whose sum is σ = 81945648. Its totient is φ = 27315200.

The previous prime is 51215993. The next prime is 51216023. The reversal of 51216015 is 51061215.

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

It is not a de Polignac number, because 51216015 - 2¹⁰ = 51214991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51215982 and 51216000.

It is a congruent 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, 1707186 + ... + 1707215.

It is an arithmetic number, because the mean of its divisors is an integer number (10243206).

Almost surely, 2^51216015 is an apocalyptic number.

51216015 is a deficient number, since it is larger than the sum of its proper divisors (30729633).

51216015 is a wasteful number, since it uses less digits than its factorization.

51216015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3414409.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 51216015 is about 7156.5365226484. The cubic root of 51216015 is about 371.3658188224.

It can be divided in two parts, 5 and 1216015, that added together give a triangular number (1216020 = T₁₅₅₉).

The spelling of 51216015 in words is "fifty-one million, two hundred sixteen thousand, fifteen".