51515479 has 4 divisors (see below), whose sum is σ = 54226840. Its totient is φ = 48804120.

The previous prime is 51515473. The next prime is 51515489. The reversal of 51515479 is 97451515.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51515479 - 2⁵ = 51515447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51515473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1355652 + ... + 1355689.

It is an arithmetic number, because the mean of its divisors is an integer number (13556710).

Almost surely, 2^51515479 is an apocalyptic number.

51515479 is a deficient number, since it is larger than the sum of its proper divisors (2711361).

51515479 is a wasteful number, since it uses less digits than its factorization.

51515479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2711360.

The product of its digits is 31500, while the sum is 37.

The square root of 51515479 is about 7177.4284392114. The cubic root of 51515479 is about 372.0882142321.

The spelling of 51515479 in words is "fifty-one million, five hundred fifteen thousand, four hundred seventy-nine".