188497145 has 4 divisors (see below), whose sum is σ = 226196580. Its totient is φ = 150797712.

The previous prime is 188497123. The next prime is 188497147. The reversal of 188497145 is 541794881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 541794881 = 503 ⋅1077127.

It can be written as a sum of positive squares in 2 ways, for example, as 60264169 + 128232976 = 7763^2 + 11324^2 .

It is a cyclic number.

It is not a de Polignac number, because 188497145 - 2¹² = 188493049 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 188497145.

It is not an unprimeable number, because it can be changed into a prime (188497147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18849710 + ... + 18849719.

It is an arithmetic number, because the mean of its divisors is an integer number (56549145).

Almost surely, 2^188497145 is an apocalyptic number.

It is an amenable number.

188497145 is a deficient number, since it is larger than the sum of its proper divisors (37699435).

188497145 is an equidigital number, since it uses as much as digits as its factorization.

188497145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37699434.

The product of its digits is 322560, while the sum is 47.

The square root of 188497145 is about 13729.4262443847. The cubic root of 188497145 is about 573.3699466958.

The spelling of 188497145 in words is "one hundred eighty-eight million, four hundred ninety-seven thousand, one hundred forty-five".