690895493 has 2 divisors, whose sum is σ = 690895494. Its totient is φ = 690895492.

The previous prime is 690895489. The next prime is 690895501. The reversal of 690895493 is 394598096.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 642216964 + 48678529 = 25342^2 + 6977^2 .

It is a cyclic number.

It is not a de Polignac number, because 690895493 - 2² = 690895489 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690895463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345447746 + 345447747.

It is an arithmetic number, because the mean of its divisors is an integer number (345447747).

Almost surely, 2^690895493 is an apocalyptic number.

It is an amenable number.

690895493 is a deficient number, since it is larger than the sum of its proper divisors (1).

690895493 is an equidigital number, since it uses as much as digits as its factorization.

690895493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The square root of 690895493 is about 26284.8909642022. The cubic root of 690895493 is about 884.0377010906.

The spelling of 690895493 in words is "six hundred ninety million, eight hundred ninety-five thousand, four hundred ninety-three".