91898681 has 8 divisors (see below), whose sum is σ = 105156480. Its totient is φ = 78673248.

The previous prime is 91898659. The next prime is 91898683. The reversal of 91898681 is 18689819.

It is a happy number.

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 91898681 - 2¹⁰ = 91897657 is a prime.

It is a super-2 number, since 2×91898681² = 16890735139079522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91898683) 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, 1661 + ... + 13658.

It is an arithmetic number, because the mean of its divisors is an integer number (13144560).

Almost surely, 2^91898681 is an apocalyptic number.

It is an amenable number.

91898681 is a deficient number, since it is larger than the sum of its proper divisors (13257799).

91898681 is a wasteful number, since it uses less digits than its factorization.

91898681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16183.

The product of its digits is 248832, while the sum is 50.

The square root of 91898681 is about 9586.3799736918. The cubic root of 91898681 is about 451.2699615942.

It can be divided in two parts, 918 and 98681, that added together give a palindrome (99599).

The spelling of 91898681 in words is "ninety-one million, eight hundred ninety-eight thousand, six hundred eighty-one".