91516541 has 2 divisors, whose sum is σ = 91516542. Its totient is φ = 91516540.

The previous prime is 91516511. The next prime is 91516543. The reversal of 91516541 is 14561519.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74459641 + 17056900 = 8629^2 + 4130^2 .

It is a cyclic number.

It is not a de Polignac number, because 91516541 - 2¹⁰ = 91515517 is a prime.

Together with 91516543, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 91516498 and 91516507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91516543) 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, 45758270 + 45758271.

It is an arithmetic number, because the mean of its divisors is an integer number (45758271).

Almost surely, 2^91516541 is an apocalyptic number.

It is an amenable number.

91516541 is a deficient number, since it is larger than the sum of its proper divisors (1).

91516541 is an equidigital number, since it uses as much as digits as its factorization.

91516541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5400, while the sum is 32.

The square root of 91516541 is about 9566.4278077034. The cubic root of 91516541 is about 450.6435910300.

The spelling of 91516541 in words is "ninety-one million, five hundred sixteen thousand, five hundred forty-one".