91129290 has 64 divisors (see below), whose sum is σ = 250801920. Its totient is φ = 20759040.

The previous prime is 91129277. The next prime is 91129327. The reversal of 91129290 is 9292119.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85360 + ... + 86420.

It is an arithmetic number, because the mean of its divisors is an integer number (3918780).

Almost surely, 2^91129290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91129290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125400960).

91129290 is an abundant number, since it is smaller than the sum of its proper divisors (159672630).

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

91129290 is a wasteful number, since it uses less digits than its factorization.

91129290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1487.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 91129290 is about 9546.1662461954. The cubic root of 91129290 is about 450.0070616176.

It can be divided in two parts, 91129 and 290, that added together give a palindrome (91419).

The spelling of 91129290 in words is "ninety-one million, one hundred twenty-nine thousand, two hundred ninety".