917123149 has 2 divisors, whose sum is σ = 917123150. Its totient is φ = 917123148.

The previous prime is 917123143. The next prime is 917123153. The reversal of 917123149 is 941321719.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 570493225 + 346629924 = 23885^2 + 18618^2 .

It is a cyclic number.

It is not a de Polignac number, because 917123149 - 2²⁹ = 380252237 is a prime.

It is a super-2 number, since 2×917123149² = 1682229740863352402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (917123143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 458561574 + 458561575.

It is an arithmetic number, because the mean of its divisors is an integer number (458561575).

Almost surely, 2^917123149 is an apocalyptic number.

It is an amenable number.

917123149 is a deficient number, since it is larger than the sum of its proper divisors (1).

917123149 is an equidigital number, since it uses as much as digits as its factorization.

917123149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 37.

The square root of 917123149 is about 30284.0411603207. The cubic root of 917123149 is about 971.5740020641.

The spelling of 917123149 in words is "nine hundred seventeen million, one hundred twenty-three thousand, one hundred forty-nine".