188279681 has 2 divisors, whose sum is σ = 188279682. Its totient is φ = 188279680.

The previous prime is 188279677. The next prime is 188279701. The reversal of 188279681 is 186972881.

188279681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179962225 + 8317456 = 13415^2 + 2884^2 .

It is a cyclic number.

It is not a de Polignac number, because 188279681 - 2² = 188279677 is a prime.

It is a super-2 number, since 2×188279681² = 70898476554923522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (188279381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94139840 + 94139841.

It is an arithmetic number, because the mean of its divisors is an integer number (94139841).

Almost surely, 2^188279681 is an apocalyptic number.

It is an amenable number.

188279681 is a deficient number, since it is larger than the sum of its proper divisors (1).

188279681 is an equidigital number, since it uses as much as digits as its factorization.

188279681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 50.

The square root of 188279681 is about 13721.5043271501. The cubic root of 188279681 is about 573.1493681077.

The spelling of 188279681 in words is "one hundred eighty-eight million, two hundred seventy-nine thousand, six hundred eighty-one".