51251493 has 8 divisors (see below), whose sum is σ = 71932000. Its totient is φ = 32369328.

The previous prime is 51251491. The next prime is 51251527. The reversal of 51251493 is 39415215.

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

It is not a de Polignac number, because 51251493 - 2¹ = 51251491 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51251493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51251491) 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, 449518 + ... + 449631.

It is an arithmetic number, because the mean of its divisors is an integer number (8991500).

Almost surely, 2^51251493 is an apocalyptic number.

It is an amenable number.

51251493 is a deficient number, since it is larger than the sum of its proper divisors (20680507).

51251493 is a wasteful number, since it uses less digits than its factorization.

51251493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899171.

The product of its digits is 5400, while the sum is 30.

The square root of 51251493 is about 7159.0148065219. The cubic root of 51251493 is about 371.4515490082.

The spelling of 51251493 in words is "fifty-one million, two hundred fifty-one thousand, four hundred ninety-three".