91269847881 has 9 divisors (see below), whose sum is σ = 131835533869. Its totient is φ = 60845961036.

The previous prime is 91269847861. The next prime is 91269847967. The reversal of 91269847881 is 18874896219.

The square root of 91269847881 is 302109.

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

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 91269847881 - 2²³ = 91261459273 is a prime.

It is a super-2 number, since 2×91269847881² (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 (91269847811) 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, 855976 + ... + 956678.

Almost surely, 2^91269847881 is an apocalyptic number.

91269847881 is the 302109-th square number.

91269847881 is the 151055-th centered octagonal number.

It is an amenable number.

91269847881 is a deficient number, since it is larger than the sum of its proper divisors (40565685988).

91269847881 is an frugal number, since it uses more digits than its factorization.

91269847881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201412 (or 100706 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 63.

The spelling of 91269847881 in words is "ninety-one billion, two hundred sixty-nine million, eight hundred forty-seven thousand, eight hundred eighty-one".