91969877 has 2 divisors, whose sum is σ = 91969878. Its totient is φ = 91969876.

The previous prime is 91969831. The next prime is 91969897. The reversal of 91969877 is 77896919.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56460196 + 35509681 = 7514^2 + 5959^2 .

It is an emirp because it is prime and its reverse (77896919) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91969877 - 2⁸ = 91969621 is a prime.

It is a super-3 number, since 3×91969877³ (a number of 25 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91969807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45984938 + 45984939.

It is an arithmetic number, because the mean of its divisors is an integer number (45984939).

Almost surely, 2^91969877 is an apocalyptic number.

It is an amenable number.

91969877 is a deficient number, since it is larger than the sum of its proper divisors (1).

91969877 is an equidigital number, since it uses as much as digits as its factorization.

91969877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1714608, while the sum is 56.

The square root of 91969877 is about 9590.0926481448. The cubic root of 91969877 is about 451.3864678831.

The spelling of 91969877 in words is "ninety-one million, nine hundred sixty-nine thousand, eight hundred seventy-seven".