91305381 has 8 divisors (see below), whose sum is σ = 125030944. Its totient is φ = 59225040.

The previous prime is 91305371. The next prime is 91305437. The reversal of 91305381 is 18350319.

It is a happy number.

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

It is not a de Polignac number, because 91305381 - 2⁹ = 91304869 is a prime.

It is a super-2 number, since 2×91305381² = 16673345199110322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91305301) 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, 411175 + ... + 411396.

It is an arithmetic number, because the mean of its divisors is an integer number (15628868).

Almost surely, 2^91305381 is an apocalyptic number.

It is an amenable number.

91305381 is a deficient number, since it is larger than the sum of its proper divisors (33725563).

91305381 is a wasteful number, since it uses less digits than its factorization.

91305381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822611.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 91305381 is about 9555.3849216031. The cubic root of 91305381 is about 450.2967277530.

The spelling of 91305381 in words is "ninety-one million, three hundred five thousand, three hundred eighty-one".