91555401 has 8 divisors (see below), whose sum is σ = 139513024. Its totient is φ = 52317360.

The previous prime is 91555397. The next prime is 91555417. The reversal of 91555401 is 10455519.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91555401 - 2² = 91555397 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91555441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2179870 + ... + 2179911.

It is an arithmetic number, because the mean of its divisors is an integer number (17439128).

Almost surely, 2^91555401 is an apocalyptic number.

It is an amenable number.

91555401 is a deficient number, since it is larger than the sum of its proper divisors (47957623).

91555401 is a wasteful number, since it uses less digits than its factorization.

91555401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4359791.

The product of its (nonzero) digits is 4500, while the sum is 30.

The square root of 91555401 is about 9568.4586533046. The cubic root of 91555401 is about 450.7073665022.

The spelling of 91555401 in words is "ninety-one million, five hundred fifty-five thousand, four hundred one".