164345989 has 2 divisors, whose sum is σ = 164345990. Its totient is φ = 164345988.

The previous prime is 164345983. The next prime is 164346019. The reversal of 164345989 is 989543461.

It is a happy number.

164345989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163405089 + 940900 = 12783^2 + 970^2 .

It is an emirp because it is prime and its reverse (989543461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 164345989 - 2⁷ = 164345861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164345983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82172994 + 82172995.

It is an arithmetic number, because the mean of its divisors is an integer number (82172995).

Almost surely, 2^164345989 is an apocalyptic number.

It is an amenable number.

164345989 is a deficient number, since it is larger than the sum of its proper divisors (1).

164345989 is an equidigital number, since it uses as much as digits as its factorization.

164345989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 49.

The square root of 164345989 is about 12819.7499585600. The cubic root of 164345989 is about 547.7550241900.

The spelling of 164345989 in words is "one hundred sixty-four million, three hundred forty-five thousand, nine hundred eighty-nine".