91679893 has 2 divisors, whose sum is σ = 91679894. Its totient is φ = 91679892.

The previous prime is 91679881. The next prime is 91679899. The reversal of 91679893 is 39897619.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66699889 + 24980004 = 8167^2 + 4998^2 .

It is an emirp because it is prime and its reverse (39897619) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91679893 - 2⁹ = 91679381 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91679893.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91679899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45839946 + 45839947.

It is an arithmetic number, because the mean of its divisors is an integer number (45839947).

Almost surely, 2^91679893 is an apocalyptic number.

It is an amenable number.

91679893 is a deficient number, since it is larger than the sum of its proper divisors (1).

91679893 is an equidigital number, since it uses as much as digits as its factorization.

91679893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 52.

The square root of 91679893 is about 9574.9617753806. The cubic root of 91679893 is about 450.9115563462.

The spelling of 91679893 in words is "ninety-one million, six hundred seventy-nine thousand, eight hundred ninety-three".