91369387 has 4 divisors (see below), whose sum is σ = 91399000. Its totient is φ = 91339776.

The previous prime is 91369379. The next prime is 91369393. The reversal of 91369387 is 78396319.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91369387 - 2³ = 91369379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91369357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9558 + ... + 16555.

It is an arithmetic number, because the mean of its divisors is an integer number (22849750).

Almost surely, 2^91369387 is an apocalyptic number.

91369387 is a deficient number, since it is larger than the sum of its proper divisors (29613).

91369387 is a wasteful number, since it uses less digits than its factorization.

91369387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29612.

The product of its digits is 244944, while the sum is 46.

The square root of 91369387 is about 9558.7335458208. The cubic root of 91369387 is about 450.4019240364.

The spelling of 91369387 in words is "ninety-one million, three hundred sixty-nine thousand, three hundred eighty-seven".