637390049 has 2 divisors, whose sum is σ = 637390050. Its totient is φ = 637390048.

The previous prime is 637390021. The next prime is 637390051. The reversal of 637390049 is 940093736.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 393030625 + 244359424 = 19825^2 + 15632^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-637390049 is a prime.

It is a Sophie Germain prime.

Together with 637390051, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 637389988 and 637390015.

It is not a weakly prime, because it can be changed into another prime (637320049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318695024 + 318695025.

It is an arithmetic number, because the mean of its divisors is an integer number (318695025).

Almost surely, 2^637390049 is an apocalyptic number.

It is an amenable number.

637390049 is a deficient number, since it is larger than the sum of its proper divisors (1).

637390049 is an equidigital number, since it uses as much as digits as its factorization.

637390049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 41.

The square root of 637390049 is about 25246.5848977639. The cubic root of 637390049 is about 860.6008281132.

The spelling of 637390049 in words is "six hundred thirty-seven million, three hundred ninety thousand, forty-nine".