659890381 has 2 divisors, whose sum is σ = 659890382. Its totient is φ = 659890380.

The previous prime is 659890379. The next prime is 659890403. The reversal of 659890381 is 183098956.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 642166281 + 17724100 = 25341^2 + 4210^2 .

It is a cyclic number.

It is not a de Polignac number, because 659890381 - 2¹ = 659890379 is a prime.

It is a super-2 number, since 2×659890381² = 870910629872650322, which contains 22 as substring.

Together with 659890379, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (659890351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329945190 + 329945191.

It is an arithmetic number, because the mean of its divisors is an integer number (329945191).

Almost surely, 2^659890381 is an apocalyptic number.

It is an amenable number.

659890381 is a deficient number, since it is larger than the sum of its proper divisors (1).

659890381 is an equidigital number, since it uses as much as digits as its factorization.

659890381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 49.

The square root of 659890381 is about 25688.3316118428. The cubic root of 659890381 is about 870.6105640527.

The spelling of 659890381 in words is "six hundred fifty-nine million, eight hundred ninety thousand, three hundred eighty-one".