91918541 has 16 divisors (see below), whose sum is σ = 114343488. Its totient is φ = 72595200.

The previous prime is 91918537. The next prime is 91918553. The reversal of 91918541 is 14581919.

It is a cyclic number.

It is not a de Polignac number, because 91918541 - 2² = 91918537 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91918495 and 91918504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91918531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16475 + ... + 21336.

It is an arithmetic number, because the mean of its divisors is an integer number (7146468).

Almost surely, 2^91918541 is an apocalyptic number.

It is an amenable number.

91918541 is a deficient number, since it is larger than the sum of its proper divisors (22424947).

91918541 is a wasteful number, since it uses less digits than its factorization.

91918541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37852.

The product of its digits is 12960, while the sum is 38.

The square root of 91918541 is about 9587.4157623418. The cubic root of 91918541 is about 451.3024668700.

The spelling of 91918541 in words is "ninety-one million, nine hundred eighteen thousand, five hundred forty-one".