917989641 has 6 divisors (see below), whose sum is σ = 1325985050. Its totient is φ = 611993088.

The previous prime is 917989621. The next prime is 917989649. The reversal of 917989641 is 146989719.

It can be written as a sum of positive squares in only one way, i.e., 767068416 + 150921225 = 27696^2 + 12285^2 .

It is not a de Polignac number, because 917989641 - 2¹⁷ = 917858569 is a prime.

It is a Duffinian number.

It is a zygodrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (917989649) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50999416 + ... + 50999433.

Almost surely, 2^917989641 is an apocalyptic number.

It is an amenable number.

917989641 is a deficient number, since it is larger than the sum of its proper divisors (407995409).

917989641 is a wasteful number, since it uses less digits than its factorization.

917989641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101998855 (or 101998852 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The square root of 917989641 is about 30298.3438656307. The cubic root of 917989641 is about 971.8798846899.

The spelling of 917989641 in words is "nine hundred seventeen million, nine hundred eighty-nine thousand, six hundred forty-one".