91873387 has 2 divisors, whose sum is σ = 91873388. Its totient is φ = 91873386.

The previous prime is 91873357. The next prime is 91873399. The reversal of 91873387 is 78337819.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91873387 - 2¹⁹ = 91349099 is a prime.

It is not a weakly prime, because it can be changed into another prime (91873357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45936693 + 45936694.

It is an arithmetic number, because the mean of its divisors is an integer number (45936694).

Almost surely, 2^91873387 is an apocalyptic number.

91873387 is a deficient number, since it is larger than the sum of its proper divisors (1).

91873387 is an equidigital number, since it uses as much as digits as its factorization.

91873387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 46.

The square root of 91873387 is about 9585.0606153535. The cubic root of 91873387 is about 451.2285555963.

It can be divided in two parts, 918 and 73387, that added together give a triangular number (74305 = T₃₈₅).

The spelling of 91873387 in words is "ninety-one million, eight hundred seventy-three thousand, three hundred eighty-seven".