164720131 has 4 divisors (see below), whose sum is σ = 167828112. Its totient is φ = 161612152.

The previous prime is 164720117. The next prime is 164720137. The reversal of 164720131 is 131027461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131027461 = 359 ⋅364979.

It is a cyclic number.

It is not a de Polignac number, because 164720131 - 2⁵ = 164720099 is a prime.

It is a super-2 number, since 2×164720131² = 54265443113314322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 164720096 and 164720105.

It is not an unprimeable number, because it can be changed into a prime (164720137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1553911 + ... + 1554016.

It is an arithmetic number, because the mean of its divisors is an integer number (41957028).

Almost surely, 2^164720131 is an apocalyptic number.

164720131 is a deficient number, since it is larger than the sum of its proper divisors (3107981).

164720131 is an equidigital number, since it uses as much as digits as its factorization.

164720131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3107980.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 164720131 is about 12834.3340692067. The cubic root of 164720131 is about 548.1703732158.

Adding to 164720131 its reverse (131027461), we get a palindrome (295747592).

The spelling of 164720131 in words is "one hundred sixty-four million, seven hundred twenty thousand, one hundred thirty-one".