187045091 has 2 divisors, whose sum is σ = 187045092. Its totient is φ = 187045090.

The previous prime is 187045069. The next prime is 187045097. The reversal of 187045091 is 190540781.

It is a strong prime.

It is an emirp because it is prime and its reverse (190540781) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-187045091 is a prime.

It is not a weakly prime, because it can be changed into another prime (187045097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93522545 + 93522546.

It is an arithmetic number, because the mean of its divisors is an integer number (93522546).

Almost surely, 2^187045091 is an apocalyptic number.

187045091 is a deficient number, since it is larger than the sum of its proper divisors (1).

187045091 is an equidigital number, since it uses as much as digits as its factorization.

187045091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 187045091 is about 13676.4429220467. The cubic root of 187045091 is about 571.8938657059.

The spelling of 187045091 in words is "one hundred eighty-seven million, forty-five thousand, ninety-one".