51365491 has 8 divisors (see below), whose sum is σ = 51784880. Its totient is φ = 50948352.

The previous prime is 51365473. The next prime is 51365513. The reversal of 51365491 is 19456315.

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 51365491 - 2⁹ = 51364979 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (51365401) 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, 118411 + ... + 118843.

It is an arithmetic number, because the mean of its divisors is an integer number (6473110).

Almost surely, 2^51365491 is an apocalyptic number.

51365491 is a deficient number, since it is larger than the sum of its proper divisors (419389).

51365491 is a wasteful number, since it uses less digits than its factorization.

51365491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1125.

The product of its digits is 16200, while the sum is 34.

The square root of 51365491 is about 7166.9722337958. The cubic root of 51365491 is about 371.7267499460.

The spelling of 51365491 in words is "fifty-one million, three hundred sixty-five thousand, four hundred ninety-one".