91538077 has 2 divisors, whose sum is σ = 91538078. Its totient is φ = 91538076.

The previous prime is 91538063. The next prime is 91538089. The reversal of 91538077 is 77083519.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80389156 + 11148921 = 8966^2 + 3339^2 .

It is an emirp because it is prime and its reverse (77083519) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91538077 - 2¹⁹ = 91013789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91538177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45769038 + 45769039.

It is an arithmetic number, because the mean of its divisors is an integer number (45769039).

Almost surely, 2^91538077 is an apocalyptic number.

It is an amenable number.

91538077 is a deficient number, since it is larger than the sum of its proper divisors (1).

91538077 is an equidigital number, since it uses as much as digits as its factorization.

91538077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 91538077 is about 9567.5533445077. The cubic root of 91538077 is about 450.6789372785.

The spelling of 91538077 in words is "ninety-one million, five hundred thirty-eight thousand, seventy-seven".