51521115 has 16 divisors (see below), whose sum is σ = 83236608. Its totient is φ = 27210336.

The previous prime is 51521111. The next prime is 51521117. The reversal of 51521115 is 51112515.

It is not a de Polignac number, because 51521115 - 2² = 51521111 is a prime.

51521115 is a modest number, since divided by 21115 gives 515 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 51521091 and 51521100.

It is not an unprimeable number, because it can be changed into a prime (51521111) 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, 15129 + ... + 18218.

It is an arithmetic number, because the mean of its divisors is an integer number (5202288).

Almost surely, 2^51521115 is an apocalyptic number.

51521115 is a deficient number, since it is larger than the sum of its proper divisors (31715493).

51521115 is a wasteful number, since it uses less digits than its factorization.

51521115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33458.

The product of its digits is 250, while the sum is 21.

The square root of 51521115 is about 7177.8210482012. The cubic root of 51521115 is about 372.1017830516.

The spelling of 51521115 in words is "fifty-one million, five hundred twenty-one thousand, one hundred fifteen".