51389613 has 32 divisors (see below), whose sum is σ = 86676480. Its totient is φ = 29787120.

The previous prime is 51389593. The next prime is 51389621. The reversal of 51389613 is 31698315.

It is a happy number.

51389613 is a `hidden beast` number, since 5 + 1 + 38 + 9 + 613 = 666.

It is not a de Polignac number, because 51389613 - 2⁶ = 51389549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51389213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3070 + ... + 10592.

It is an arithmetic number, because the mean of its divisors is an integer number (2708640).

Almost surely, 2^51389613 is an apocalyptic number.

It is an amenable number.

51389613 is a deficient number, since it is larger than the sum of its proper divisors (35286867).

51389613 is a wasteful number, since it uses less digits than its factorization.

51389613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7566 (or 7560 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 51389613 is about 7168.6548947484. The cubic root of 51389613 is about 371.7849303132.

The spelling of 51389613 in words is "fifty-one million, three hundred eighty-nine thousand, six hundred thirteen".