91145381 has 8 divisors (see below), whose sum is σ = 97729920. Its totient is φ = 84696768.

The previous prime is 91145359. The next prime is 91145401. The reversal of 91145381 is 18354119.

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

It is a cyclic number.

It is not a de Polignac number, because 91145381 - 2⁶ = 91145317 is a prime.

It is a super-2 number, since 2×91145381² = 16614960955270322, which contains 22 as substring.

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 (91145311) 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, 32591 + ... + 35276.

It is an arithmetic number, because the mean of its divisors is an integer number (12216240).

Almost surely, 2^91145381 is an apocalyptic number.

It is an amenable number.

91145381 is a deficient number, since it is larger than the sum of its proper divisors (6584539).

91145381 is a wasteful number, since it uses less digits than its factorization.

91145381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67963.

The product of its digits is 4320, while the sum is 32.

The square root of 91145381 is about 9547.0090080611. The cubic root of 91145381 is about 450.0335464703.

The spelling of 91145381 in words is "ninety-one million, one hundred forty-five thousand, three hundred eighty-one".