91047621 has 16 divisors (see below), whose sum is σ = 138979328. Its totient is φ = 51937200.

The previous prime is 91047569. The next prime is 91047629. The reversal of 91047621 is 12674019.

It is a happy number.

It is not a de Polignac number, because 91047621 - 2¹⁷ = 90916549 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 (91047629) 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, 9816 + ... + 16686.

It is an arithmetic number, because the mean of its divisors is an integer number (8686208).

Almost surely, 2^91047621 is an apocalyptic number.

It is an amenable number.

91047621 is a deficient number, since it is larger than the sum of its proper divisors (47931707).

91047621 is a wasteful number, since it uses less digits than its factorization.

91047621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7512.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 91047621 is about 9541.8877063189. The cubic root of 91047621 is about 449.8725910905.

The spelling of 91047621 in words is "ninety-one million, forty-seven thousand, six hundred twenty-one".