164163381 has 4 divisors (see below), whose sum is σ = 218884512. Its totient is φ = 109442252.

The previous prime is 164163371. The next prime is 164163409. The reversal of 164163381 is 183361461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 164163381 - 2⁷ = 164163253 is a prime.

It is a super-2 number, since 2×164163381² = 53899231322702322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164163371) 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, 27360561 + ... + 27360566.

It is an arithmetic number, because the mean of its divisors is an integer number (54721128).

Almost surely, 2^164163381 is an apocalyptic number.

It is an amenable number.

164163381 is a deficient number, since it is larger than the sum of its proper divisors (54721131).

164163381 is an equidigital number, since it uses as much as digits as its factorization.

164163381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54721130.

The product of its digits is 10368, while the sum is 33.

The square root of 164163381 is about 12812.6258432844. The cubic root of 164163381 is about 547.5520752786.

The spelling of 164163381 in words is "one hundred sixty-four million, one hundred sixty-three thousand, three hundred eighty-one".