91912549 has 2 divisors, whose sum is σ = 91912550. Its totient is φ = 91912548.

The previous prime is 91912537. The next prime is 91912609. The reversal of 91912549 is 94521919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57608100 + 34304449 = 7590^2 + 5857^2 .

It is a cyclic number.

It is not a de Polignac number, because 91912549 - 2¹³ = 91904357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91912949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45956274 + 45956275.

It is an arithmetic number, because the mean of its divisors is an integer number (45956275).

Almost surely, 2^91912549 is an apocalyptic number.

It is an amenable number.

91912549 is a deficient number, since it is larger than the sum of its proper divisors (1).

91912549 is an equidigital number, since it uses as much as digits as its factorization.

91912549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 40.

The square root of 91912549 is about 9587.1032642817. The cubic root of 91912549 is about 451.2926601320.

The spelling of 91912549 in words is "ninety-one million, nine hundred twelve thousand, five hundred forty-nine".