51245491 has 8 divisors (see below), whose sum is σ = 56199168. Its totient is φ = 46341000.

The previous prime is 51245479. The next prime is 51245501. The reversal of 51245491 is 19454215.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51245491 is a prime.

It is a super-2 number, since 2×51245491² = 5252200695662162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51245401) 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, 10095 + ... + 14296.

It is an arithmetic number, because the mean of its divisors is an integer number (7024896).

Almost surely, 2^51245491 is an apocalyptic number.

51245491 is a deficient number, since it is larger than the sum of its proper divisors (4953677).

51245491 is a wasteful number, since it uses less digits than its factorization.

51245491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24593.

The product of its digits is 7200, while the sum is 31.

The square root of 51245491 is about 7158.5956024908. The cubic root of 51245491 is about 371.4370483625.

It can be divided in two parts, 51 and 245491, that added together give a palindrome (245542).

The spelling of 51245491 in words is "fifty-one million, two hundred forty-five thousand, four hundred ninety-one".