51394693 has 4 divisors (see below), whose sum is σ = 58736800. Its totient is φ = 44052588.

The previous prime is 51394669. The next prime is 51394697. The reversal of 51394693 is 39649315.

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: 39649315 = 5 ⋅7929863.

It is a cyclic number.

It is not a de Polignac number, because 51394693 - 2⁵ = 51394661 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 (51394697) 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, 3671043 + ... + 3671056.

It is an arithmetic number, because the mean of its divisors is an integer number (14684200).

Almost surely, 2^51394693 is an apocalyptic number.

It is an amenable number.

51394693 is a deficient number, since it is larger than the sum of its proper divisors (7342107).

51394693 is an equidigital number, since it uses as much as digits as its factorization.

51394693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7342106.

The product of its digits is 87480, while the sum is 40.

The square root of 51394693 is about 7169.0092062990. The cubic root of 51394693 is about 371.7971805528.

The spelling of 51394693 in words is "fifty-one million, three hundred ninety-four thousand, six hundred ninety-three".