690490093 has 2 divisors, whose sum is σ = 690490094. Its totient is φ = 690490092.

The previous prime is 690490079. The next prime is 690490103. The reversal of 690490093 is 390094096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 689692644 + 797449 = 26262^2 + 893^2 .

It is a cyclic number.

It is not a de Polignac number, because 690490093 - 2²¹ = 688392941 is a prime.

It is a super-2 number, since 2×690490093² = 953553137062297298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690490013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345245046 + 345245047.

It is an arithmetic number, because the mean of its divisors is an integer number (345245047).

Almost surely, 2^690490093 is an apocalyptic number.

It is an amenable number.

690490093 is a deficient number, since it is larger than the sum of its proper divisors (1).

690490093 is an equidigital number, since it uses as much as digits as its factorization.

690490093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 690490093 is about 26277.1781780312. The cubic root of 690490093 is about 883.8647569390.

The spelling of 690490093 in words is "six hundred ninety million, four hundred ninety thousand, ninety-three".