919108661 has 2 divisors, whose sum is σ = 919108662. Its totient is φ = 919108660.

The previous prime is 919108649. The next prime is 919108711. The reversal of 919108661 is 166801919.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 910168561 + 8940100 = 30169^2 + 2990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-919108661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (919101661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459554330 + 459554331.

It is an arithmetic number, because the mean of its divisors is an integer number (459554331).

Almost surely, 2^919108661 is an apocalyptic number.

It is an amenable number.

919108661 is a deficient number, since it is larger than the sum of its proper divisors (1).

919108661 is an equidigital number, since it uses as much as digits as its factorization.

919108661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 919108661 is about 30316.8049273006. The cubic root of 919108661 is about 972.2746282228.

The spelling of 919108661 in words is "nine hundred nineteen million, one hundred eight thousand, six hundred sixty-one".