164643047 has 4 divisors (see below), whose sum is σ = 166340496. Its totient is φ = 162945600.

The previous prime is 164643043. The next prime is 164643049. The reversal of 164643047 is 740346461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 164643047 - 2² = 164643043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 164642998 and 164643016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164643043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 848579 + ... + 848772.

It is an arithmetic number, because the mean of its divisors is an integer number (41585124).

Almost surely, 2^164643047 is an apocalyptic number.

164643047 is a deficient number, since it is larger than the sum of its proper divisors (1697449).

164643047 is an equidigital number, since it uses as much as digits as its factorization.

164643047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1697448.

The product of its (nonzero) digits is 48384, while the sum is 35.

The square root of 164643047 is about 12831.3306792398. The cubic root of 164643047 is about 548.0848508657.

The spelling of 164643047 in words is "one hundred sixty-four million, six hundred forty-three thousand, forty-seven".