91240049 has 4 divisors (see below), whose sum is σ = 91562736. Its totient is φ = 90917364.

The previous prime is 91240031. The next prime is 91240063. The reversal of 91240049 is 94004219.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91240049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91240069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160919 + ... + 161484.

It is an arithmetic number, because the mean of its divisors is an integer number (22890684).

Almost surely, 2^91240049 is an apocalyptic number.

It is an amenable number.

91240049 is a deficient number, since it is larger than the sum of its proper divisors (322687).

91240049 is a wasteful number, since it uses less digits than its factorization.

91240049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322686.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 91240049 is about 9551.9657139251. The cubic root of 91240049 is about 450.1893014254.

The spelling of 91240049 in words is "ninety-one million, two hundred forty thousand, forty-nine".