51394493 has 2 divisors, whose sum is σ = 51394494. Its totient is φ = 51394492.

The previous prime is 51394463. The next prime is 51394501. The reversal of 51394493 is 39449315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31663129 + 19731364 = 5627^2 + 4442^2 .

It is a cyclic number.

It is not a de Polignac number, because 51394493 - 2¹⁰ = 51393469 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51394403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25697246 + 25697247.

It is an arithmetic number, because the mean of its divisors is an integer number (25697247).

Almost surely, 2^51394493 is an apocalyptic number.

It is an amenable number.

51394493 is a deficient number, since it is larger than the sum of its proper divisors (1).

51394493 is an equidigital number, since it uses as much as digits as its factorization.

51394493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 38.

The square root of 51394493 is about 7168.9952573565. The cubic root of 51394493 is about 371.7966982752.

The spelling of 51394493 in words is "fifty-one million, three hundred ninety-four thousand, four hundred ninety-three".