91141621 has 8 divisors (see below), whose sum is σ = 91885464. Its totient is φ = 90401280.

The previous prime is 91141597. The next prime is 91141627. The reversal of 91141621 is 12614119.

It can be written as a sum of positive squares in 4 ways, for example, as 5948721 + 85192900 = 2439^2 + 9230^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91141621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91141627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75801 + ... + 76993.

It is an arithmetic number, because the mean of its divisors is an integer number (11485683).

Almost surely, 2^91141621 is an apocalyptic number.

It is an amenable number.

91141621 is a deficient number, since it is larger than the sum of its proper divisors (743843).

91141621 is a wasteful number, since it uses less digits than its factorization.

91141621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1751.

The product of its digits is 432, while the sum is 25.

The square root of 91141621 is about 9546.8120857174. The cubic root of 91141621 is about 450.0273580075.

The spelling of 91141621 in words is "ninety-one million, one hundred forty-one thousand, six hundred twenty-one".