91401813 has 12 divisors (see below), whose sum is σ = 132976480. Its totient is φ = 60495336.

The previous prime is 91401787. The next prime is 91401829. The reversal of 91401813 is 31810419.

It is not a de Polignac number, because 91401813 - 2⁵ = 91401781 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91401853) 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, 35281 + ... + 37782.

Almost surely, 2^91401813 is an apocalyptic number.

It is an amenable number.

91401813 is a deficient number, since it is larger than the sum of its proper divisors (41574667).

91401813 is a wasteful number, since it uses less digits than its factorization.

91401813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73208 (or 73205 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 91401813 is about 9560.4295405594. The cubic root of 91401813 is about 450.4551986466.

The spelling of 91401813 in words is "ninety-one million, four hundred one thousand, eight hundred thirteen".