91098894 has 32 divisors (see below), whose sum is σ = 188614656. Its totient is φ = 29302560.

The previous prime is 91098877. The next prime is 91098919. The reversal of 91098894 is 49889019.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119964 + ... + 120720.

It is an arithmetic number, because the mean of its divisors is an integer number (5894208).

Almost surely, 2^91098894 is an apocalyptic number.

91098894 is an abundant number, since it is smaller than the sum of its proper divisors (97515762).

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

91098894 is a wasteful number, since it uses less digits than its factorization.

91098894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1440.

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 91098894 is about 9544.5740606902. The cubic root of 91098894 is about 449.9570230561.

It can be divided in two parts, 9 and 1098894, that added together give a triangular number (1098903 = T₁₄₈₂).

The spelling of 91098894 in words is "ninety-one million, ninety-eight thousand, eight hundred ninety-four".