91673287 has 2 divisors, whose sum is σ = 91673288. Its totient is φ = 91673286.

The previous prime is 91673279. The next prime is 91673303. The reversal of 91673287 is 78237619.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (78237619) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91673287 - 2³ = 91673279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91673227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45836643 + 45836644.

It is an arithmetic number, because the mean of its divisors is an integer number (45836644).

Almost surely, 2^91673287 is an apocalyptic number.

91673287 is a deficient number, since it is larger than the sum of its proper divisors (1).

91673287 is an equidigital number, since it uses as much as digits as its factorization.

91673287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 43.

The square root of 91673287 is about 9574.6168069537. The cubic root of 91673287 is about 450.9007259333.

The spelling of 91673287 in words is "ninety-one million, six hundred seventy-three thousand, two hundred eighty-seven".