697488137 has 2 divisors, whose sum is σ = 697488138. Its totient is φ = 697488136.

The previous prime is 697488089. The next prime is 697488139. The reversal of 697488137 is 731884796.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 493683961 + 203804176 = 22219^2 + 14276^2 .

It is a cyclic number.

It is not a de Polignac number, because 697488137 - 2²² = 693293833 is a prime.

Together with 697488139, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (697488139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348744068 + 348744069.

It is an arithmetic number, because the mean of its divisors is an integer number (348744069).

Almost surely, 2^697488137 is an apocalyptic number.

It is an amenable number.

697488137 is a deficient number, since it is larger than the sum of its proper divisors (1).

697488137 is an equidigital number, since it uses as much as digits as its factorization.

697488137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 53.

The square root of 697488137 is about 26410.0007004922. Note that the first 3 decimals coincide. The cubic root of 697488137 is about 886.8406844805.

The spelling of 697488137 in words is "six hundred ninety-seven million, four hundred eighty-eight thousand, one hundred thirty-seven".