189745861 has 2 divisors, whose sum is σ = 189745862. Its totient is φ = 189745860.

The previous prime is 189745859. The next prime is 189745877. The reversal of 189745861 is 168547981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188925025 + 820836 = 13745^2 + 906^2 .

It is a cyclic number.

It is not a de Polignac number, because 189745861 - 2¹ = 189745859 is a prime.

Together with 189745859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189740861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94872930 + 94872931.

It is an arithmetic number, because the mean of its divisors is an integer number (94872931).

Almost surely, 2^189745861 is an apocalyptic number.

It is an amenable number.

189745861 is a deficient number, since it is larger than the sum of its proper divisors (1).

189745861 is an equidigital number, since it uses as much as digits as its factorization.

189745861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 49.

The square root of 189745861 is about 13774.8270769545. The cubic root of 189745861 is about 574.6332744127.

The spelling of 189745861 in words is "one hundred eighty-nine million, seven hundred forty-five thousand, eight hundred sixty-one".