981566129 has 2 divisors, whose sum is σ = 981566130. Its totient is φ = 981566128.

The previous prime is 981566119. The next prime is 981566141. The reversal of 981566129 is 921665189.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 868186225 + 113379904 = 29465^2 + 10648^2 .

It is an emirp because it is prime and its reverse (921665189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 981566129 - 2¹² = 981562033 is a prime.

It is not a weakly prime, because it can be changed into another prime (981566119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490783064 + 490783065.

It is an arithmetic number, because the mean of its divisors is an integer number (490783065).

Almost surely, 2^981566129 is an apocalyptic number.

It is an amenable number.

981566129 is a deficient number, since it is larger than the sum of its proper divisors (1).

981566129 is an equidigital number, since it uses as much as digits as its factorization.

981566129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 47.

The square root of 981566129 is about 31329.9557771791. The cubic root of 981566129 is about 993.8172284516.

The spelling of 981566129 in words is "nine hundred eighty-one million, five hundred sixty-six thousand, one hundred twenty-nine".