189868451 has 2 divisors, whose sum is σ = 189868452. Its totient is φ = 189868450.

The previous prime is 189868447. The next prime is 189868453. The reversal of 189868451 is 154868981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 189868451 - 2² = 189868447 is a prime.

Together with 189868453, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 189868451.

It is not a weakly prime, because it can be changed into another prime (189868453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94934225 + 94934226.

It is an arithmetic number, because the mean of its divisors is an integer number (94934226).

Almost surely, 2^189868451 is an apocalyptic number.

189868451 is a deficient number, since it is larger than the sum of its proper divisors (1).

189868451 is an equidigital number, since it uses as much as digits as its factorization.

189868451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 552960, while the sum is 50.

The square root of 189868451 is about 13779.2761420911. The cubic root of 189868451 is about 574.7569997778.

The spelling of 189868451 in words is "one hundred eighty-nine million, eight hundred sixty-eight thousand, four hundred fifty-one".