91403081 has 48 divisors (see below), whose sum is σ = 123907968. Its totient is φ = 66528000.

The previous prime is 91403077. The next prime is 91403083. The reversal of 91403081 is 18030419.

It is not a de Polignac number, because 91403081 - 2² = 91403077 is a prime.

It is a super-2 number, since 2×91403081² = 16709046432585122, which contains 22 as substring.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91403081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91403083) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 904931 + ... + 905031.

It is an arithmetic number, because the mean of its divisors is an integer number (2581416).

Almost surely, 2^91403081 is an apocalyptic number.

It is an amenable number.

91403081 is a deficient number, since it is larger than the sum of its proper divisors (32504887).

91403081 is a wasteful number, since it uses less digits than its factorization.

91403081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 91403081 is about 9560.4958553414. The cubic root of 91403081 is about 450.4572816635.

It can be divided in two parts, 9140 and 3081, that added together give a palindrome (12221).

The spelling of 91403081 in words is "ninety-one million, four hundred three thousand, eighty-one".