637374949 has 2 divisors, whose sum is σ = 637374950. Its totient is φ = 637374948.

The previous prime is 637374883. The next prime is 637374967. The reversal of 637374949 is 949473736.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 480048100 + 157326849 = 21910^2 + 12543^2 .

It is a cyclic number.

It is not a de Polignac number, because 637374949 - 2⁷ = 637374821 is a prime.

It is a super-2 number, since 2×637374949² = 812493651225505202, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 637374896 and 637374905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (637374989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318687474 + 318687475.

It is an arithmetic number, because the mean of its divisors is an integer number (318687475).

Almost surely, 2^637374949 is an apocalyptic number.

It is an amenable number.

637374949 is a deficient number, since it is larger than the sum of its proper divisors (1).

637374949 is an equidigital number, since it uses as much as digits as its factorization.

637374949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3429216, while the sum is 52.

The square root of 637374949 is about 25246.2858456447. The cubic root of 637374949 is about 860.5940320782.

It can be divided in two parts, 63737 and 4949, that added together give a palindrome (68686).

The spelling of 637374949 in words is "six hundred thirty-seven million, three hundred seventy-four thousand, nine hundred forty-nine".