51215007 has 16 divisors (see below), whose sum is σ = 71995392. Its totient is φ = 32336160.

The previous prime is 51214991. The next prime is 51215029. The reversal of 51215007 is 70051215.

It is not a de Polignac number, because 51215007 - 2⁴ = 51214991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51211007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1488 + ... + 10229.

It is an arithmetic number, because the mean of its divisors is an integer number (4499712).

Almost surely, 2^51215007 is an apocalyptic number.

51215007 is a deficient number, since it is larger than the sum of its proper divisors (20780385).

51215007 is a wasteful number, since it uses less digits than its factorization.

51215007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11798.

The product of its (nonzero) digits is 350, while the sum is 21.

The square root of 51215007 is about 7156.4660971739. The cubic root of 51215007 is about 371.3633824803.

The spelling of 51215007 in words is "fifty-one million, two hundred fifteen thousand, seven".