189704981 has 2 divisors, whose sum is σ = 189704982. Its totient is φ = 189704980.

The previous prime is 189704969. The next prime is 189704993. The reversal of 189704981 is 189407981.

It is a balanced prime because it is at equal distance from previous prime (189704969) and next prime (189704993).

It can be written as a sum of positive squares in only one way, i.e., 150454756 + 39250225 = 12266^2 + 6265^2 .

It is a cyclic number.

It is not a de Polignac number, because 189704981 - 2⁶ = 189704917 is a prime.

It is a super-2 number, since 2×189704981² = 71975959632420722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189704951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94852490 + 94852491.

It is an arithmetic number, because the mean of its divisors is an integer number (94852491).

Almost surely, 2^189704981 is an apocalyptic number.

It is an amenable number.

189704981 is a deficient number, since it is larger than the sum of its proper divisors (1).

189704981 is an equidigital number, since it uses as much as digits as its factorization.

189704981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 47.

The square root of 189704981 is about 13773.3431308452. The cubic root of 189704981 is about 574.5920039552.

The spelling of 189704981 in words is "one hundred eighty-nine million, seven hundred four thousand, nine hundred eighty-one".