91609434 has 128 divisors (see below), whose sum is σ = 246412800. Its totient is φ = 24675840.

The previous prime is 91609429. The next prime is 91609471. The reversal of 91609434 is 43490619.

91609434 is a `hidden beast` number, since 9 + 1 + 609 + 43 + 4 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 668614 + ... + 668750.

It is an arithmetic number, because the mean of its divisors is an integer number (1925100).

Almost surely, 2^91609434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91609434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123206400).

91609434 is an abundant number, since it is smaller than the sum of its proper divisors (154803366).

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

91609434 is a wasteful number, since it uses less digits than its factorization.

91609434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 91609434 is about 9571.2817323491. The cubic root of 91609434 is about 450.7960133093.

The spelling of 91609434 in words is "ninety-one million, six hundred nine thousand, four hundred thirty-four".