917242457 has 4 divisors (see below), whose sum is σ = 917386980. Its totient is φ = 917097936.

The previous prime is 917242427. The next prime is 917242471. The reversal of 917242457 is 754242719.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 754242719 = 4547 ⋅165877.

It can be written as a sum of positive squares in 2 ways, for example, as 25563136 + 891679321 = 5056^2 + 29861^2 .

It is a cyclic number.

It is not a de Polignac number, because 917242457 - 2²² = 913048153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (917242427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62282 + ... + 75587.

It is an arithmetic number, because the mean of its divisors is an integer number (229346745).

Almost surely, 2^917242457 is an apocalyptic number.

It is an amenable number.

917242457 is a deficient number, since it is larger than the sum of its proper divisors (144523).

917242457 is a wasteful number, since it uses less digits than its factorization.

917242457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144522.

The product of its digits is 141120, while the sum is 41.

The square root of 917242457 is about 30286.0109126309. The cubic root of 917242457 is about 971.6161307303.

The spelling of 917242457 in words is "nine hundred seventeen million, two hundred forty-two thousand, four hundred fifty-seven".