51520259 has 8 divisors (see below), whose sum is σ = 58925568. Its totient is φ = 44126280.

The previous prime is 51520247. The next prime is 51520277. The reversal of 51520259 is 95202515.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51520259 - 2⁸ = 51520003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51520219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12374 + ... + 16004.

It is an arithmetic number, because the mean of its divisors is an integer number (7365696).

Almost surely, 2^51520259 is an apocalyptic number.

51520259 is a deficient number, since it is larger than the sum of its proper divisors (7405309).

51520259 is a wasteful number, since it uses less digits than its factorization.

51520259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5665.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 51520259 is about 7177.7614198300. The cubic root of 51520259 is about 372.0997222726.

The spelling of 51520259 in words is "fifty-one million, five hundred twenty thousand, two hundred fifty-nine".