91555641 has 12 divisors (see below), whose sum is σ = 132387840. Its totient is φ = 60972120.

The previous prime is 91555627. The next prime is 91555657. The reversal of 91555641 is 14655519.

91555641 is a `hidden beast` number, since 9 + 1 + 5 + 5 + 5 + 641 = 666.

It is not a de Polignac number, because 91555641 - 2⁵ = 91555609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91555596 and 91555605.

It is not an unprimeable number, because it can be changed into a prime (91555691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4456 + ... + 14246.

It is an arithmetic number, because the mean of its divisors is an integer number (11032320).

Almost surely, 2^91555641 is an apocalyptic number.

It is an amenable number.

91555641 is a deficient number, since it is larger than the sum of its proper divisors (40832199).

91555641 is a wasteful number, since it uses less digits than its factorization.

91555641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10836 (or 10833 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The square root of 91555641 is about 9568.4711945012. The cubic root of 91555641 is about 450.7077603245.

The spelling of 91555641 in words is "ninety-one million, five hundred fifty-five thousand, six hundred forty-one".