188221801 has 4 divisors (see below), whose sum is σ = 194293504. Its totient is φ = 182150100.

The previous prime is 188221769. The next prime is 188221829. The reversal of 188221801 is 108122881.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 188221801 - 2⁵ = 188221769 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 6071671 = 188221801 / (1 + 8 + 8 + 2 + 2 + 1 + 8 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (188221871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3035805 + ... + 3035866.

It is an arithmetic number, because the mean of its divisors is an integer number (48573376).

Almost surely, 2^188221801 is an apocalyptic number.

188221801 is the 6136-th centered decagonal number.

It is an amenable number.

188221801 is a deficient number, since it is larger than the sum of its proper divisors (6071703).

188221801 is an equidigital number, since it uses as much as digits as its factorization.

188221801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6071702.

The product of its (nonzero) digits is 2048, while the sum is 31.

The square root of 188221801 is about 13719.3950668388. The cubic root of 188221801 is about 573.0906305155.

The spelling of 188221801 in words is "one hundred eighty-eight million, two hundred twenty-one thousand, eight hundred one".