164929381 has 4 divisors (see below), whose sum is σ = 168764992. Its totient is φ = 161093772.

The previous prime is 164929361. The next prime is 164929399. The reversal of 164929381 is 183929461.

It is a happy number.

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 164929381 - 2¹¹ = 164927333 is a prime.

It is a super-2 number, since 2×164929381² = 54403401434086322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 3835567 = 164929381 / (1 + 6 + 4 + 9 + 2 + 9 + 3 + 8 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164929301) 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, 1917741 + ... + 1917826.

It is an arithmetic number, because the mean of its divisors is an integer number (42191248).

Almost surely, 2^164929381 is an apocalyptic number.

It is an amenable number.

164929381 is a deficient number, since it is larger than the sum of its proper divisors (3835611).

164929381 is an equidigital number, since it uses as much as digits as its factorization.

164929381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3835610.

The product of its digits is 93312, while the sum is 43.

The square root of 164929381 is about 12842.4834436335. The cubic root of 164929381 is about 548.4023952785.

The spelling of 164929381 in words is "one hundred sixty-four million, nine hundred twenty-nine thousand, three hundred eighty-one".