91420964881 has 9 divisors (see below), whose sum is σ = 92134888699. Its totient is φ = 90712537744.

The previous prime is 91420964797. The next prime is 91420964933. The reversal of 91420964881 is 18846902419.

The square root of 91420964881 is 302359.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 53701110225 + 37719854656 = 231735^2 + 194216^2 .

It is not a de Polignac number, because 91420964881 - 2²⁵ = 91387410449 is a prime.

It is a super-2 number, since 2×91420964881² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91420962881) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 41422080 + ... + 41424286.

Almost surely, 2^91420964881 is an apocalyptic number.

91420964881 is the 302359-th square number.

91420964881 is the 151180-th centered octagonal number.

It is an amenable number.

91420964881 is a deficient number, since it is larger than the sum of its proper divisors (713923818).

91420964881 is an frugal number, since it uses more digits than its factorization.

91420964881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4688 (or 2344 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 52.

The spelling of 91420964881 in words is "ninety-one billion, four hundred twenty million, nine hundred sixty-four thousand, eight hundred eighty-one".