91917261 has 10 divisors (see below), whose sum is σ = 137308622. Its totient is φ = 61278120.

The previous prime is 91917253. The next prime is 91917277. The reversal of 91917261 is 16271919.

It can be written as a sum of positive squares in only one way, i.e., 59768361 + 32148900 = 7731^2 + 5670^2 .

It is not a de Polignac number, because 91917261 - 2³ = 91917253 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91917281) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 567310 + ... + 567471.

Almost surely, 2^91917261 is an apocalyptic number.

It is an amenable number.

91917261 is a deficient number, since it is larger than the sum of its proper divisors (45391361).

91917261 is a wasteful number, since it uses less digits than its factorization.

91917261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1134793 (or 1134784 counting only the distinct ones).

The product of its digits is 6804, while the sum is 36.

The square root of 91917261 is about 9587.3490079375. The cubic root of 91917261 is about 451.3003720085.

The spelling of 91917261 in words is "ninety-one million, nine hundred seventeen thousand, two hundred sixty-one".