91102981 has 8 divisors (see below), whose sum is σ = 92750400. Its totient is φ = 89469600.

The previous prime is 91102969. The next prime is 91102997. The reversal of 91102981 is 18920119.

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 91102981 - 2⁹ = 91102469 is a prime.

It is a super-2 number, since 2×91102981² = 16599506294172722, 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 (91102961) 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, 10050 + ... + 16828.

It is an arithmetic number, because the mean of its divisors is an integer number (11593800).

Almost surely, 2^91102981 is an apocalyptic number.

It is an amenable number.

91102981 is a deficient number, since it is larger than the sum of its proper divisors (1647419).

91102981 is a wasteful number, since it uses less digits than its factorization.

91102981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7019.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 91102981 is about 9544.7881589902. The cubic root of 91102981 is about 449.9637518127.

The spelling of 91102981 in words is "ninety-one million, one hundred two thousand, nine hundred eighty-one".