164145631 has 8 divisors (see below), whose sum is σ = 178595984. Its totient is φ = 149955840.

The previous prime is 164145629. The next prime is 164145649. The reversal of 164145631 is 136541461.

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 164145631 - 2¹ = 164145629 is a prime.

It is a super-2 number, since 2×164145631² = 53887576352776322, 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 = 164145593 and 164145602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164145601) 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, 63825 + ... + 66346.

It is an arithmetic number, because the mean of its divisors is an integer number (22324498).

Almost surely, 2^164145631 is an apocalyptic number.

164145631 is a deficient number, since it is larger than the sum of its proper divisors (14450353).

164145631 is a wasteful number, since it uses less digits than its factorization.

164145631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130281.

The product of its digits is 8640, while the sum is 31.

The square root of 164145631 is about 12811.9331484363. The cubic root of 164145631 is about 547.5323400620.

The spelling of 164145631 in words is "one hundred sixty-four million, one hundred forty-five thousand, six hundred thirty-one".