91239249 has 20 divisors (see below), whose sum is σ = 128927216. Its totient is φ = 57362928.

The previous prime is 91239241. The next prime is 91239263. The reversal of 91239249 is 94293219.

It is not a de Polignac number, because 91239249 - 2³ = 91239241 is a prime.

It is a Duffinian number.

Its product of digits (34992) is a multiple of the sum of its prime factors (162).

It is not an unprimeable number, because it can be changed into a prime (91239241) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2121822 + ... + 2121864.

Almost surely, 2^91239249 is an apocalyptic number.

It is an amenable number.

91239249 is a deficient number, since it is larger than the sum of its proper divisors (37687967).

91239249 is an frugal number, since it uses more digits than its factorization.

91239249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162 (or 75 counting only the distinct ones).

The product of its digits is 34992, while the sum is 39.

The square root of 91239249 is about 9551.9238376361. The cubic root of 91239249 is about 450.1879856564.

The spelling of 91239249 in words is "ninety-one million, two hundred thirty-nine thousand, two hundred forty-nine".