51637493 has 2 divisors, whose sum is σ = 51637494. Its totient is φ = 51637492.

The previous prime is 51637447. The next prime is 51637501. The reversal of 51637493 is 39473615.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51509329 + 128164 = 7177^2 + 358^2 .

It is a cyclic number.

It is not a de Polignac number, because 51637493 - 2¹² = 51633397 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51637433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25818746 + 25818747.

It is an arithmetic number, because the mean of its divisors is an integer number (25818747).

Almost surely, 2^51637493 is an apocalyptic number.

It is an amenable number.

51637493 is a deficient number, since it is larger than the sum of its proper divisors (1).

51637493 is an equidigital number, since it uses as much as digits as its factorization.

51637493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 38.

The square root of 51637493 is about 7185.9232531387. The cubic root of 51637493 is about 372.3817452651.

The spelling of 51637493 in words is "fifty-one million, six hundred thirty-seven thousand, four hundred ninety-three".