637542097 has 2 divisors, whose sum is σ = 637542098. Its totient is φ = 637542096.

The previous prime is 637542089. The next prime is 637542127. The reversal of 637542097 is 790245736.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 327465216 + 310076881 = 18096^2 + 17609^2 .

It is a cyclic number.

It is not a de Polignac number, because 637542097 - 2³ = 637542089 is a prime.

It is not a weakly prime, because it can be changed into another prime (637542047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318771048 + 318771049.

It is an arithmetic number, because the mean of its divisors is an integer number (318771049).

Almost surely, 2^637542097 is an apocalyptic number.

It is an amenable number.

637542097 is a deficient number, since it is larger than the sum of its proper divisors (1).

637542097 is an equidigital number, since it uses as much as digits as its factorization.

637542097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 317520, while the sum is 43.

The square root of 637542097 is about 25249.5959769657. The cubic root of 637542097 is about 860.6692541533.

The spelling of 637542097 in words is "six hundred thirty-seven million, five hundred forty-two thousand, ninety-seven".