917873149 has 2 divisors, whose sum is σ = 917873150. Its totient is φ = 917873148.

The previous prime is 917873107. The next prime is 917873237. The reversal of 917873149 is 941378719.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 653160249 + 264712900 = 25557^2 + 16270^2 .

It is an emirp because it is prime and its reverse (941378719) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 917873149 - 2¹⁵ = 917840381 is a prime.

It is a super-2 number, since 2×917873149² = 1684982235310352402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (917873549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 458936574 + 458936575.

It is an arithmetic number, because the mean of its divisors is an integer number (458936575).

Almost surely, 2^917873149 is an apocalyptic number.

It is an amenable number.

917873149 is a deficient number, since it is larger than the sum of its proper divisors (1).

917873149 is an equidigital number, since it uses as much as digits as its factorization.

917873149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 49.

The square root of 917873149 is about 30296.4213893324. The cubic root of 917873149 is about 971.8387727442.

The spelling of 917873149 in words is "nine hundred seventeen million, eight hundred seventy-three thousand, one hundred forty-nine".