164869949 has 2 divisors, whose sum is σ = 164869950. Its totient is φ = 164869948.

The previous prime is 164869931. The next prime is 164869963. The reversal of 164869949 is 949968461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132664324 + 32205625 = 11518^2 + 5675^2 .

It is a cyclic number.

It is not a de Polignac number, because 164869949 - 2⁸ = 164869693 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 164869894 and 164869903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164862949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82434974 + 82434975.

It is an arithmetic number, because the mean of its divisors is an integer number (82434975).

Almost surely, 2^164869949 is an apocalyptic number.

It is an amenable number.

164869949 is a deficient number, since it is larger than the sum of its proper divisors (1).

164869949 is an equidigital number, since it uses as much as digits as its factorization.

164869949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3359232, while the sum is 56.

The square root of 164869949 is about 12840.1693524657. The cubic root of 164869949 is about 548.3365154321.

The spelling of 164869949 in words is "one hundred sixty-four million, eight hundred sixty-nine thousand, nine hundred forty-nine".