91370681 has 8 divisors (see below), whose sum is σ = 92881728. Its totient is φ = 89866000.

The previous prime is 91370611. The next prime is 91370701. The reversal of 91370681 is 18607319.

91370681 = 234² + 235² + ... + 659².

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91370681 is a prime.

It is a super-2 number, since 2×91370681² = 16697202692807522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91370611) 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, 33551 + ... + 36171.

It is an arithmetic number, because the mean of its divisors is an integer number (11610216).

Almost surely, 2^91370681 is an apocalyptic number.

It is an amenable number.

91370681 is a deficient number, since it is larger than the sum of its proper divisors (1511047).

91370681 is a wasteful number, since it uses less digits than its factorization.

91370681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3183.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 91370681 is about 9558.8012323722. The cubic root of 91370681 is about 450.4040502677.

The spelling of 91370681 in words is "ninety-one million, three hundred seventy thousand, six hundred eighty-one".