164127381 has 8 divisors (see below), whose sum is σ = 238730784. Its totient is φ = 99471120.

The previous prime is 164127347. The next prime is 164127389. The reversal of 164127381 is 183721461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 164127381 - 2⁶ = 164127317 is a prime.

It is a super-2 number, since 2×164127381² = 53875594387838322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 4973557 = 164127381 / (1 + 6 + 4 + 1 + 2 + 7 + 3 + 8 + 1).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164127389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2486746 + ... + 2486811.

It is an arithmetic number, because the mean of its divisors is an integer number (29841348).

Almost surely, 2^164127381 is an apocalyptic number.

164127381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

164127381 is a deficient number, since it is larger than the sum of its proper divisors (74603403).

164127381 is a wasteful number, since it uses less digits than its factorization.

164127381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4973571.

The product of its digits is 8064, while the sum is 33.

The square root of 164127381 is about 12811.2209020062. The cubic root of 164127381 is about 547.5120474403.

The spelling of 164127381 in words is "one hundred sixty-four million, one hundred twenty-seven thousand, three hundred eighty-one".