187912945209 has 16 divisors (see below), whose sum is σ = 287713601280. Its totient is φ = 107892599760.

The previous prime is 187912945189. The next prime is 187912945211. The reversal of 187912945209 is 902549219781.

It is not a de Polignac number, because 187912945209 - 2¹⁵ = 187912912441 is a prime.

It is a super-2 number, since 2×187912945209² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (187912945229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149850207 + ... + 149851460.

It is an arithmetic number, because the mean of its divisors is an integer number (17982100080).

Almost surely, 2^187912945209 is an apocalyptic number.

187912945209 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

187912945209 is a deficient number, since it is larger than the sum of its proper divisors (99800656071).

187912945209 is a wasteful number, since it uses less digits than its factorization.

187912945209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299701700.

The product of its (nonzero) digits is 3265920, while the sum is 57.

The spelling of 187912945209 in words is "one hundred eighty-seven billion, nine hundred twelve million, nine hundred forty-five thousand, two hundred nine".