91552861 has 2 divisors, whose sum is σ = 91552862. Its totient is φ = 91552860.

The previous prime is 91552843. The next prime is 91552897. The reversal of 91552861 is 16825519.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88472836 + 3080025 = 9406^2 + 1755^2 .

It is an emirp because it is prime and its reverse (16825519) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91552861 - 2⁵ = 91552829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91552861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91552801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45776430 + 45776431.

It is an arithmetic number, because the mean of its divisors is an integer number (45776431).

Almost surely, 2^91552861 is an apocalyptic number.

It is an amenable number.

91552861 is a deficient number, since it is larger than the sum of its proper divisors (1).

91552861 is an equidigital number, since it uses as much as digits as its factorization.

91552861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 37.

The square root of 91552861 is about 9568.3259246328. The cubic root of 91552861 is about 450.7031985075.

The spelling of 91552861 in words is "ninety-one million, five hundred fifty-two thousand, eight hundred sixty-one".