801990617 has 2 divisors, whose sum is σ = 801990618. Its totient is φ = 801990616.

The previous prime is 801990583. The next prime is 801990619. The reversal of 801990617 is 716099108.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 498673561 + 303317056 = 22331^2 + 17416^2 .

It is a cyclic number.

It is not a de Polignac number, because 801990617 - 2²² = 797796313 is a prime.

Together with 801990619, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (801990619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400995308 + 400995309.

It is an arithmetic number, because the mean of its divisors is an integer number (400995309).

Almost surely, 2^801990617 is an apocalyptic number.

It is an amenable number.

801990617 is a deficient number, since it is larger than the sum of its proper divisors (1).

801990617 is an equidigital number, since it uses as much as digits as its factorization.

801990617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 801990617 is about 28319.4388539039. The cubic root of 801990617 is about 929.0870977768.

The spelling of 801990617 in words is "eight hundred one million, nine hundred ninety thousand, six hundred seventeen".