164431155 has 32 divisors (see below), whose sum is σ = 301607424. Its totient is φ = 74935296.

The previous prime is 164431151. The next prime is 164431181. The reversal of 164431155 is 551134461.

It is a happy number.

It is not a de Polignac number, because 164431155 - 2² = 164431151 is a prime.

It is a super-3 number, since 3×164431155³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (164431151) 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 31 ways as a sum of consecutive naturals, for example, 34179 + ... + 38691.

It is an arithmetic number, because the mean of its divisors is an integer number (9425232).

Almost surely, 2^164431155 is an apocalyptic number.

164431155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

164431155 is a deficient number, since it is larger than the sum of its proper divisors (137176269).

164431155 is a wasteful number, since it uses less digits than its factorization.

164431155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4875.

The product of its digits is 7200, while the sum is 30.

The square root of 164431155 is about 12823.0711999895. The cubic root of 164431155 is about 547.8496255222.

The spelling of 164431155 in words is "one hundred sixty-four million, four hundred thirty-one thousand, one hundred fifty-five".