91616093 has 2 divisors, whose sum is σ = 91616094. Its totient is φ = 91616092.

The previous prime is 91616089. The next prime is 91616137. The reversal of 91616093 is 39061619.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58415449 + 33200644 = 7643^2 + 5762^2 .

It is an emirp because it is prime and its reverse (39061619) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91616093 - 2² = 91616089 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91616003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45808046 + 45808047.

It is an arithmetic number, because the mean of its divisors is an integer number (45808047).

Almost surely, 2^91616093 is an apocalyptic number.

It is an amenable number.

91616093 is a deficient number, since it is larger than the sum of its proper divisors (1).

91616093 is an equidigital number, since it uses as much as digits as its factorization.

91616093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 91616093 is about 9571.6295895736. The cubic root of 91616093 is about 450.8069356849.

The spelling of 91616093 in words is "ninety-one million, six hundred sixteen thousand, ninety-three".