91350013 has 2 divisors, whose sum is σ = 91350014. Its totient is φ = 91350012.

The previous prime is 91349987. The next prime is 91350031. The reversal of 91350013 is 31005319.

Together with next prime (91350031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78375609 + 12974404 = 8853^2 + 3602^2 .

It is an emirp because it is prime and its reverse (31005319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91350013 - 2⁵ = 91349981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91350053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45675006 + 45675007.

It is an arithmetic number, because the mean of its divisors is an integer number (45675007).

Almost surely, 2^91350013 is an apocalyptic number.

It is an amenable number.

91350013 is a deficient number, since it is larger than the sum of its proper divisors (1).

91350013 is an equidigital number, since it uses as much as digits as its factorization.

91350013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 405, while the sum is 22.

The square root of 91350013 is about 9557.7200733229. The cubic root of 91350013 is about 450.3700873203.

The spelling of 91350013 in words is "ninety-one million, three hundred fifty thousand, thirteen".