690453557 has 2 divisors, whose sum is σ = 690453558. Its totient is φ = 690453556.

The previous prime is 690453551. The next prime is 690453563. The reversal of 690453557 is 755354096.

It is a balanced prime because it is at equal distance from previous prime (690453551) and next prime (690453563).

It can be written as a sum of positive squares in only one way, i.e., 566487601 + 123965956 = 23801^2 + 11134^2 .

It is a cyclic number.

It is not a de Polignac number, because 690453557 - 2⁴ = 690453541 is a prime.

It is a super-2 number, since 2×690453557² = 953452228747904498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690453551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345226778 + 345226779.

It is an arithmetic number, because the mean of its divisors is an integer number (345226779).

Almost surely, 2^690453557 is an apocalyptic number.

It is an amenable number.

690453557 is a deficient number, since it is larger than the sum of its proper divisors (1).

690453557 is an equidigital number, since it uses as much as digits as its factorization.

690453557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 567000, while the sum is 44.

The square root of 690453557 is about 26276.4829648109. The cubic root of 690453557 is about 883.8491673104.

The spelling of 690453557 in words is "six hundred ninety million, four hundred fifty-three thousand, five hundred fifty-seven".