51249793 has 4 divisors (see below), whose sum is σ = 58571200. Its totient is φ = 43928388.

The previous prime is 51249791. The next prime is 51249811. The reversal of 51249793 is 39794215.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39794215 = 5 ⋅7958843.

It is not a de Polignac number, because 51249793 - 2¹ = 51249791 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51249791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3660693 + ... + 3660706.

It is an arithmetic number, because the mean of its divisors is an integer number (14642800).

Almost surely, 2^51249793 is an apocalyptic number.

It is an amenable number.

51249793 is a deficient number, since it is larger than the sum of its proper divisors (7321407).

51249793 is an equidigital number, since it uses as much as digits as its factorization.

51249793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7321406.

The product of its digits is 68040, while the sum is 40.

The square root of 51249793 is about 7158.8960741165. The cubic root of 51249793 is about 371.4474419759.

It can be divided in two parts, 512 and 49793, that added together give a palindrome (50305).

The spelling of 51249793 in words is "fifty-one million, two hundred forty-nine thousand, seven hundred ninety-three".