91040621 has 8 divisors (see below), whose sum is σ = 104129664. Its totient is φ = 77972400.

The previous prime is 91040617. The next prime is 91040641. The reversal of 91040621 is 12604019.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 91040621 - 2² = 91040617 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 (91040641) 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, 5696 + ... + 14646.

It is an arithmetic number, because the mean of its divisors is an integer number (13016208).

Almost surely, 2^91040621 is an apocalyptic number.

It is an amenable number.

91040621 is a deficient number, since it is larger than the sum of its proper divisors (13089043).

91040621 is a wasteful number, since it uses less digits than its factorization.

91040621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10411.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 91040621 is about 9541.5208955386. The cubic root of 91040621 is about 449.8610616337.

The spelling of 91040621 in words is "ninety-one million, forty thousand, six hundred twenty-one".