51289951 has 4 divisors (see below), whose sum is σ = 53058600. Its totient is φ = 49521304.

The previous prime is 51289937. The next prime is 51289957. The reversal of 51289951 is 15998215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15998215 = 5 ⋅3199643.

It is a cyclic number.

It is not a de Polignac number, because 51289951 - 2⁵ = 51289919 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 (51289957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 884281 + ... + 884338.

It is an arithmetic number, because the mean of its divisors is an integer number (13264650).

Almost surely, 2^51289951 is an apocalyptic number.

51289951 is a deficient number, since it is larger than the sum of its proper divisors (1768649).

51289951 is a wasteful number, since it uses less digits than its factorization.

51289951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1768648.

The product of its digits is 32400, while the sum is 40.

The square root of 51289951 is about 7161.7002869430. The cubic root of 51289951 is about 371.5444354863.

The spelling of 51289951 in words is "fifty-one million, two hundred eighty-nine thousand, nine hundred fifty-one".