91649405 has 4 divisors (see below), whose sum is σ = 109979292. Its totient is φ = 73319520.

The previous prime is 91649377. The next prime is 91649413. The reversal of 91649405 is 50494619.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51681721 + 39967684 = 7189^2 + 6322^2 .

It is not a de Polignac number, because 91649405 - 2¹⁴ = 91633021 is a prime.

It is a super-2 number, since 2×91649405² = 16799226873708050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9164936 + ... + 9164945.

It is an arithmetic number, because the mean of its divisors is an integer number (27494823).

Almost surely, 2^91649405 is an apocalyptic number.

It is an amenable number.

91649405 is a deficient number, since it is larger than the sum of its proper divisors (18329887).

91649405 is a wasteful number, since it uses less digits than its factorization.

91649405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18329886.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 91649405 is about 9573.3695739797. The cubic root of 91649405 is about 450.8615675019.

The spelling of 91649405 in words is "ninety-one million, six hundred forty-nine thousand, four hundred five".