91239649 has 8 divisors (see below), whose sum is σ = 92949120. Its totient is φ = 89546256.

The previous prime is 91239647. The next prime is 91239677. The reversal of 91239649 is 94693219.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91239649 - 2¹ = 91239647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91239647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7752 + ... + 15574.

It is an arithmetic number, because the mean of its divisors is an integer number (11618640).

Almost surely, 2^91239649 is an apocalyptic number.

It is an amenable number.

91239649 is a deficient number, since it is larger than the sum of its proper divisors (1709471).

91239649 is a wasteful number, since it uses less digits than its factorization.

91239649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8039.

The product of its digits is 104976, while the sum is 43.

The square root of 91239649 is about 9551.9447758035. The cubic root of 91239649 is about 450.1886435418.

The spelling of 91239649 in words is "ninety-one million, two hundred thirty-nine thousand, six hundred forty-nine".