51389522 has 18 divisors (see below), whose sum is σ = 79806447. Its totient is φ = 24817824.

The previous prime is 51389497. The next prime is 51389539. The reversal of 51389522 is 22598315.

It can be written as a sum of positive squares in 5 ways, for example, as 48427681 + 2961841 = 6959^2 + 1721^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=5069.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 375038 + ... + 375174.

Almost surely, 2^51389522 is an apocalyptic number.

51389522 is a deficient number, since it is larger than the sum of its proper divisors (28416925).

51389522 is an equidigital number, since it uses as much as digits as its factorization.

51389522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350 (or 176 counting only the distinct ones).

The product of its digits is 21600, while the sum is 35.

The square root of 51389522 is about 7168.6485476692. The cubic root of 51389522 is about 371.7847108626.

The spelling of 51389522 in words is "fifty-one million, three hundred eighty-nine thousand, five hundred twenty-two".