91916145 has 12 divisors (see below), whose sum is σ = 159321396. Its totient is φ = 49021920.

The previous prime is 91916141. The next prime is 91916171. The reversal of 91916145 is 54161919.

It can be written as a sum of positive squares in 2 ways, for example, as 22810176 + 69105969 = 4776^2 + 8313^2 .

It is not a de Polignac number, because 91916145 - 2² = 91916141 is a prime.

It is a super-2 number, since 2×91916145² = 16897155423322050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91916141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1021246 + ... + 1021335.

It is an arithmetic number, because the mean of its divisors is an integer number (13276783).

Almost surely, 2^91916145 is an apocalyptic number.

It is an amenable number.

91916145 is a deficient number, since it is larger than the sum of its proper divisors (67405251).

91916145 is a wasteful number, since it uses less digits than its factorization.

91916145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2042592 (or 2042589 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 91916145 is about 9587.2908060620. The cubic root of 91916145 is about 451.2985455353.

The spelling of 91916145 in words is "ninety-one million, nine hundred sixteen thousand, one hundred forty-five".