91407649 has 8 divisors (see below), whose sum is σ = 94033280. Its totient is φ = 88790256.

The previous prime is 91407647. The next prime is 91407683. The reversal of 91407649 is 94670419.

It is a happy number.

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 91407649 - 2¹ = 91407647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91407647) 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, 25672 + ... + 29014.

It is an arithmetic number, because the mean of its divisors is an integer number (11754160).

Almost surely, 2^91407649 is an apocalyptic number.

It is an amenable number.

91407649 is a deficient number, since it is larger than the sum of its proper divisors (2625631).

91407649 is a wasteful number, since it uses less digits than its factorization.

91407649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4119.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 91407649 is about 9560.7347520993. The cubic root of 91407649 is about 450.4647856213.

The spelling of 91407649 in words is "ninety-one million, four hundred seven thousand, six hundred forty-nine".