1697778113 has 2 divisors, whose sum is σ = 1697778114. Its totient is φ = 1697778112.

The previous prime is 1697778007. The next prime is 1697778179. The reversal of 1697778113 is 3118777961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1057030144 + 640747969 = 32512^2 + 25313^2 .

It is a cyclic number.

It is not a de Polignac number, because 1697778113 - 2²⁸ = 1429342657 is a prime.

It is not a weakly prime, because it can be changed into another prime (1697778713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 848889056 + 848889057.

It is an arithmetic number, because the mean of its divisors is an integer number (848889057).

Almost surely, 2^1697778113 is an apocalyptic number.

It is an amenable number.

1697778113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1697778113 is an equidigital number, since it uses as much as digits as its factorization.

1697778113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 444528, while the sum is 50.

The square root of 1697778113 is about 41204.1031087925. The cubic root of 1697778113 is about 1192.9630074340.

The spelling of 1697778113 in words is "one billion, six hundred ninety-seven million, seven hundred seventy-eight thousand, one hundred thirteen".