91725511 has 2 divisors, whose sum is σ = 91725512. Its totient is φ = 91725510.

The previous prime is 91725509. The next prime is 91725547. The reversal of 91725511 is 11552719.

It is a weak prime.

It is an emirp because it is prime and its reverse (11552719) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91725511 - 2¹ = 91725509 is a prime.

It is a super-2 number, since 2×91725511² = 16827138736422242, which contains 22 as substring.

Together with 91725509, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91725581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45862755 + 45862756.

It is an arithmetic number, because the mean of its divisors is an integer number (45862756).

Almost surely, 2^91725511 is an apocalyptic number.

91725511 is a deficient number, since it is larger than the sum of its proper divisors (1).

91725511 is an equidigital number, since it uses as much as digits as its factorization.

91725511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3150, while the sum is 31.

The square root of 91725511 is about 9577.3436296293. The cubic root of 91725511 is about 450.9863320030.

The spelling of 91725511 in words is "ninety-one million, seven hundred twenty-five thousand, five hundred eleven".