164689391 has 8 divisors (see below), whose sum is σ = 173211264. Its totient is φ = 156368160.

The previous prime is 164689373. The next prime is 164689411. The reversal of 164689391 is 193986461.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164689391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164689351) 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, 48476 + ... + 51761.

It is an arithmetic number, because the mean of its divisors is an integer number (21651408).

Almost surely, 2^164689391 is an apocalyptic number.

164689391 is a deficient number, since it is larger than the sum of its proper divisors (8521873).

164689391 is a wasteful number, since it uses less digits than its factorization.

164689391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100321.

The product of its digits is 279936, while the sum is 47.

The square root of 164689391 is about 12833.1364443771. The cubic root of 164689391 is about 548.1362713213.

The spelling of 164689391 in words is "one hundred sixty-four million, six hundred eighty-nine thousand, three hundred ninety-one".