698085257 has 2 divisors, whose sum is σ = 698085258. Its totient is φ = 698085256.

The previous prime is 698085239. The next prime is 698085307. The reversal of 698085257 is 752580896.

It is an a-pointer prime, because the next prime (698085307) can be obtained adding 698085257 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 500148496 + 197936761 = 22364^2 + 14069^2 .

It is a cyclic number.

It is not a de Polignac number, because 698085257 - 2²⁴ = 681308041 is a prime.

It is not a weakly prime, because it can be changed into another prime (698082257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349042628 + 349042629.

It is an arithmetic number, because the mean of its divisors is an integer number (349042629).

Almost surely, 2^698085257 is an apocalyptic number.

It is an amenable number.

698085257 is a deficient number, since it is larger than the sum of its proper divisors (1).

698085257 is an equidigital number, since it uses as much as digits as its factorization.

698085257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1209600, while the sum is 50.

The square root of 698085257 is about 26421.3030904988. The cubic root of 698085257 is about 887.0936872376.

The spelling of 698085257 in words is "six hundred ninety-eight million, eighty-five thousand, two hundred fifty-seven".