164861243 has 4 divisors (see below), whose sum is σ = 165001320. Its totient is φ = 164721168.

The previous prime is 164861209. The next prime is 164861261. The reversal of 164861243 is 342168461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342168461 = 7417 ⋅46133.

It is a cyclic number.

It is not a de Polignac number, because 164861243 - 2¹⁶ = 164795707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164861443) 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, 68258 + ... + 70631.

It is an arithmetic number, because the mean of its divisors is an integer number (41250330).

Almost surely, 2^164861243 is an apocalyptic number.

164861243 is a deficient number, since it is larger than the sum of its proper divisors (140077).

164861243 is a wasteful number, since it uses less digits than its factorization.

164861243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140076.

The product of its digits is 27648, while the sum is 35.

The square root of 164861243 is about 12839.8303337700. The cubic root of 164861243 is about 548.3268635787.

The spelling of 164861243 in words is "one hundred sixty-four million, eight hundred sixty-one thousand, two hundred forty-three".