189461813 has 2 divisors, whose sum is σ = 189461814. Its totient is φ = 189461812.

The previous prime is 189461809. The next prime is 189461819. The reversal of 189461813 is 318164981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189392644 + 69169 = 13762^2 + 263^2 .

It is a cyclic number.

It is not a de Polignac number, because 189461813 - 2² = 189461809 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189461819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94730906 + 94730907.

It is an arithmetic number, because the mean of its divisors is an integer number (94730907).

Almost surely, 2^189461813 is an apocalyptic number.

It is an amenable number.

189461813 is a deficient number, since it is larger than the sum of its proper divisors (1).

189461813 is an equidigital number, since it uses as much as digits as its factorization.

189461813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 41.

The square root of 189461813 is about 13764.5128137541. The cubic root of 189461813 is about 574.3463907756.

The spelling of 189461813 in words is "one hundred eighty-nine million, four hundred sixty-one thousand, eight hundred thirteen".