91362921169 has 9 divisors (see below), whose sum is σ = 98935702299. Its totient is φ = 84331377000.

The previous prime is 91362921131. The next prime is 91362921193. The reversal of 91362921169 is 96112926319.

The square root of 91362921169 is 302263.

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., 13515225025 + 77847696144 = 116255^2 + 279012^2 .

It is a de Polignac number, because none of the positive numbers 2^k-91362921169 is a prime.

It is a super-2 number, since 2×91362921169² (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 (91362921119) 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, 3917794 + ... + 3941044.

It is an arithmetic number, because the mean of its divisors is an integer number (10992855811).

Almost surely, 2^91362921169 is an apocalyptic number.

91362921169 is the 302263-rd square number.

91362921169 is the 151132-nd centered octagonal number.

It is an amenable number.

91362921169 is a deficient number, since it is larger than the sum of its proper divisors (7572781130).

91362921169 is an frugal number, since it uses more digits than its factorization.

91362921169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46528 (or 23264 counting only the distinct ones).

The product of its digits is 314928, while the sum is 49.

Multiplying 91362921169 by its sum of digits (49), we get a square (4476783137281 = 2115841²).

The spelling of 91362921169 in words is "ninety-one billion, three hundred sixty-two million, nine hundred twenty-one thousand, one hundred sixty-nine".