91687877 has 2 divisors, whose sum is σ = 91687878. Its totient is φ = 91687876.

The previous prime is 91687873. The next prime is 91687891. The reversal of 91687877 is 77878619.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73034116 + 18653761 = 8546^2 + 4319^2 .

It is a cyclic number.

It is not a de Polignac number, because 91687877 - 2² = 91687873 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91687873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45843938 + 45843939.

It is an arithmetic number, because the mean of its divisors is an integer number (45843939).

Almost surely, 2^91687877 is an apocalyptic number.

It is an amenable number.

91687877 is a deficient number, since it is larger than the sum of its proper divisors (1).

91687877 is an equidigital number, since it uses as much as digits as its factorization.

91687877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1185408, while the sum is 53.

The square root of 91687877 is about 9575.3786870285. The cubic root of 91687877 is about 450.9246452699.

The spelling of 91687877 in words is "ninety-one million, six hundred eighty-seven thousand, eight hundred seventy-seven".