91649454 has 64 divisors (see below), whose sum is σ = 210954240. Its totient is φ = 26328960.

The previous prime is 91649449. The next prime is 91649471. The reversal of 91649454 is 45494619.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69469 + ... + 70775.

It is an arithmetic number, because the mean of its divisors is an integer number (3296160).

Almost surely, 2^91649454 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91649454, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105477120).

91649454 is an abundant number, since it is smaller than the sum of its proper divisors (119304786).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91649454 is a wasteful number, since it uses less digits than its factorization.

91649454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1385.

The product of its digits is 155520, while the sum is 42.

The square root of 91649454 is about 9573.3721331619. The cubic root of 91649454 is about 450.8616478523.

The spelling of 91649454 in words is "ninety-one million, six hundred forty-nine thousand, four hundred fifty-four".