189470681 has 2 divisors, whose sum is σ = 189470682. Its totient is φ = 189470680.

The previous prime is 189470591. The next prime is 189470683. The reversal of 189470681 is 186074981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150283081 + 39187600 = 12259^2 + 6260^2 .

It is an emirp because it is prime and its reverse (186074981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189470681 - 2¹⁴ = 189454297 is a prime.

It is a super-2 number, since 2×189470681² = 71798277917207522, which contains 22 as substring.

Together with 189470683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (189470683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94735340 + 94735341.

It is an arithmetic number, because the mean of its divisors is an integer number (94735341).

Almost surely, 2^189470681 is an apocalyptic number.

It is an amenable number.

189470681 is a deficient number, since it is larger than the sum of its proper divisors (1).

189470681 is an equidigital number, since it uses as much as digits as its factorization.

189470681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 189470681 is about 13764.8349427082. The cubic root of 189470681 is about 574.3553516391.

The spelling of 189470681 in words is "one hundred eighty-nine million, four hundred seventy thousand, six hundred eighty-one".