188909137 has 4 divisors (see below), whose sum is σ = 188955760. Its totient is φ = 188862516.

The previous prime is 188909111. The next prime is 188909141. The reversal of 188909137 is 731909881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 731909881 = 181 ⋅4043701.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188909137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (188909197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16587 + ... + 25552.

It is an arithmetic number, because the mean of its divisors is an integer number (47238940).

Almost surely, 2^188909137 is an apocalyptic number.

It is an amenable number.

188909137 is a deficient number, since it is larger than the sum of its proper divisors (46623).

188909137 is an equidigital number, since it uses as much as digits as its factorization.

188909137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46622.

The product of its (nonzero) digits is 108864, while the sum is 46.

The square root of 188909137 is about 13744.4220322282. The cubic root of 188909137 is about 573.7873746583.

The spelling of 188909137 in words is "one hundred eighty-eight million, nine hundred nine thousand, one hundred thirty-seven".