164631945 has 8 divisors (see below), whose sum is σ = 263411136. Its totient is φ = 87803696.

The previous prime is 164631937. The next prime is 164631947. The reversal of 164631945 is 549136461.

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

It is a cyclic number.

It is not a de Polignac number, because 164631945 - 2³ = 164631937 is a prime.

It is a super-3 number, since 3×164631945³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (164631947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5487717 + ... + 5487746.

It is an arithmetic number, because the mean of its divisors is an integer number (32926392).

Almost surely, 2^164631945 is an apocalyptic number.

164631945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

164631945 is a deficient number, since it is larger than the sum of its proper divisors (98779191).

164631945 is a wasteful number, since it uses less digits than its factorization.

164631945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10975471.

The product of its digits is 77760, while the sum is 39.

The square root of 164631945 is about 12830.8980589825. The cubic root of 164631945 is about 548.0725313359.

The spelling of 164631945 in words is "one hundred sixty-four million, six hundred thirty-one thousand, nine hundred forty-five".