51397959 has 8 divisors (see below), whose sum is σ = 68654592. Its totient is φ = 34203320.

The previous prime is 51397949. The next prime is 51397961. The reversal of 51397959 is 95979315.

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 51397959 - 2¹⁵ = 51365191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51397949) 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, 13527 + ... + 16904.

It is an arithmetic number, because the mean of its divisors is an integer number (8581824).

Almost surely, 2^51397959 is an apocalyptic number.

51397959 is a deficient number, since it is larger than the sum of its proper divisors (17256633).

51397959 is a wasteful number, since it uses less digits than its factorization.

51397959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30997.

The product of its digits is 382725, while the sum is 48.

The square root of 51397959 is about 7169.2369886899. The cubic root of 51397959 is about 371.8050559695.

The spelling of 51397959 in words is "fifty-one million, three hundred ninety-seven thousand, nine hundred fifty-nine".