91961573 has 12 divisors (see below), whose sum is σ = 101314080. Its totient is φ = 83409480.

The previous prime is 91961561. The next prime is 91961579. The reversal of 91961573 is 37516919.

It is not a de Polignac number, because 91961573 - 2⁴ = 91961557 is a prime.

It is a super-3 number, since 3×91961573³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 91961573.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91961579) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99608 + ... + 100526.

It is an arithmetic number, because the mean of its divisors is an integer number (8442840).

Almost surely, 2^91961573 is an apocalyptic number.

It is an amenable number.

91961573 is a deficient number, since it is larger than the sum of its proper divisors (9352507).

91961573 is a wasteful number, since it uses less digits than its factorization.

91961573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1768 (or 1757 counting only the distinct ones).

The product of its digits is 51030, while the sum is 41.

The square root of 91961573 is about 9589.6596915636. The cubic root of 91961573 is about 451.3728821810.

The spelling of 91961573 in words is "ninety-one million, nine hundred sixty-one thousand, five hundred seventy-three".