164774909 has 16 divisors (see below), whose sum is σ = 181527360. Its totient is φ = 148642560.

The previous prime is 164774891. The next prime is 164774927. The reversal of 164774909 is 909477461.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (164774891) and next prime (164774927).

It is a cyclic number.

It is not a de Polignac number, because 164774909 - 2¹⁶ = 164709373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164774959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120389 + ... + 121749.

It is an arithmetic number, because the mean of its divisors is an integer number (11345460).

Almost surely, 2^164774909 is an apocalyptic number.

It is an amenable number.

164774909 is a deficient number, since it is larger than the sum of its proper divisors (16752451).

164774909 is a wasteful number, since it uses less digits than its factorization.

164774909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580.

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 164774909 is about 12836.4679331972. The cubic root of 164774909 is about 548.2311315226.

The spelling of 164774909 in words is "one hundred sixty-four million, seven hundred seventy-four thousand, nine hundred nine".