91816272145 has 32 divisors (see below), whose sum is σ = 125867619360. Its totient is φ = 63696015360.

The previous prime is 91816272139. The next prime is 91816272151. The reversal of 91816272145 is 54127261819.

It is a Cunningham number, because it is equal to 303012²+1.

It is an interprime number because it is at equal distance from previous prime (91816272139) and next prime (91816272151).

It can be written as a sum of positive squares in 16 ways, for example, as 55338328081 + 36477944064 = 235241^2 + 190992^2 .

It is not a de Polignac number, because 91816272145 - 2³³ = 83226337553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91816272095 and 91816272104.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 521011 + ... + 674599.

It is an arithmetic number, because the mean of its divisors is an integer number (3933363105).

Almost surely, 2^91816272145 is an apocalyptic number.

It is an amenable number.

91816272145 is a deficient number, since it is larger than the sum of its proper divisors (34051347215).

91816272145 is a wasteful number, since it uses less digits than its factorization.

91816272145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154165.

The product of its digits is 241920, while the sum is 46.

The spelling of 91816272145 in words is "ninety-one billion, eight hundred sixteen million, two hundred seventy-two thousand, one hundred forty-five".