91530397 has 16 divisors (see below), whose sum is σ = 111404160. Its totient is φ = 73410048.

The previous prime is 91530379. The next prime is 91530401. The reversal of 91530397 is 79303519.

It is not a de Polignac number, because 91530397 - 2¹⁹ = 91006109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91530347) 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, 19153 + ... + 23449.

It is an arithmetic number, because the mean of its divisors is an integer number (6962760).

Almost surely, 2^91530397 is an apocalyptic number.

It is an amenable number.

91530397 is a deficient number, since it is larger than the sum of its proper divisors (19873763).

91530397 is a wasteful number, since it uses less digits than its factorization.

91530397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4500.

The product of its (nonzero) digits is 25515, while the sum is 37.

The square root of 91530397 is about 9567.1519795601. The cubic root of 91530397 is about 450.6663330116. Note that the first 3 decimals are identical.

The spelling of 91530397 in words is "ninety-one million, five hundred thirty thousand, three hundred ninety-seven".