91398556 has 6 divisors (see below), whose sum is σ = 159947480. Its totient is φ = 45699276.

The previous prime is 91398539. The next prime is 91398577. The reversal of 91398556 is 65589319.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11424816 + ... + 11424823.

Almost surely, 2^91398556 is an apocalyptic number.

It is an amenable number.

91398556 is a deficient number, since it is larger than the sum of its proper divisors (68548924).

91398556 is a wasteful number, since it uses less digits than its factorization.

91398556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22849643 (or 22849641 counting only the distinct ones).

The product of its digits is 291600, while the sum is 46.

The square root of 91398556 is about 9560.2592015070. The cubic root of 91398556 is about 450.4498480963.

The spelling of 91398556 in words is "ninety-one million, three hundred ninety-eight thousand, five hundred fifty-six".