91408511 has 2 divisors, whose sum is σ = 91408512. Its totient is φ = 91408510.

The previous prime is 91408501. The next prime is 91408531. The reversal of 91408511 is 11580419.

It is a weak prime.

It is an emirp because it is prime and its reverse (11580419) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91408511 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91408501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45704255 + 45704256.

It is an arithmetic number, because the mean of its divisors is an integer number (45704256).

Almost surely, 2^91408511 is an apocalyptic number.

91408511 is a deficient number, since it is larger than the sum of its proper divisors (1).

91408511 is an equidigital number, since it uses as much as digits as its factorization.

91408511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 91408511 is about 9560.7798322103. The cubic root of 91408511 is about 450.4662016203.

It can be divided in two parts, 91408 and 511, that added together give a palindrome (91919).

The spelling of 91408511 in words is "ninety-one million, four hundred eight thousand, five hundred eleven".