697894157 has 2 divisors, whose sum is σ = 697894158. Its totient is φ = 697894156.

The previous prime is 697894151. The next prime is 697894159. The reversal of 697894157 is 751498796.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 683613316 + 14280841 = 26146^2 + 3779^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-697894157 is a prime.

Together with 697894159, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (697894151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348947078 + 348947079.

It is an arithmetic number, because the mean of its divisors is an integer number (348947079).

Almost surely, 2^697894157 is an apocalyptic number.

It is an amenable number.

697894157 is a deficient number, since it is larger than the sum of its proper divisors (1).

697894157 is an equidigital number, since it uses as much as digits as its factorization.

697894157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 56.

The square root of 697894157 is about 26417.6864429874. The cubic root of 697894157 is about 887.0127329066.

The spelling of 697894157 in words is "six hundred ninety-seven million, eight hundred ninety-four thousand, one hundred fifty-seven".