188143997 has 2 divisors, whose sum is σ = 188143998. Its totient is φ = 188143996.

The previous prime is 188143993. The next prime is 188144003. The reversal of 188143997 is 799341881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180929401 + 7214596 = 13451^2 + 2686^2 .

It is a cyclic number.

It is not a de Polignac number, because 188143997 - 2² = 188143993 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188143993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94071998 + 94071999.

It is an arithmetic number, because the mean of its divisors is an integer number (94071999).

Almost surely, 2^188143997 is an apocalyptic number.

It is an amenable number.

188143997 is a deficient number, since it is larger than the sum of its proper divisors (1).

188143997 is an equidigital number, since it uses as much as digits as its factorization.

188143997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 50.

The square root of 188143997 is about 13716.5592259867. The cubic root of 188143997 is about 573.0116547391.

The spelling of 188143997 in words is "one hundred eighty-eight million, one hundred forty-three thousand, nine hundred ninety-seven".