164187997 has 8 divisors (see below), whose sum is σ = 171873792. Its totient is φ = 156651600.

The previous prime is 164187979. The next prime is 164188021. The reversal of 164187997 is 799781461.

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 164187997 - 2²³ = 155799389 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 (164187977) 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, 35098 + ... + 39499.

It is an arithmetic number, because the mean of its divisors is an integer number (21484224).

Almost surely, 2^164187997 is an apocalyptic number.

It is an amenable number.

164187997 is a deficient number, since it is larger than the sum of its proper divisors (7685795).

164187997 is an equidigital number, since it uses as much as digits as its factorization.

164187997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74699.

The product of its digits is 762048, while the sum is 52.

The square root of 164187997 is about 12813.5864222317. The cubic root of 164187997 is about 547.5794420562.

The spelling of 164187997 in words is "one hundred sixty-four million, one hundred eighty-seven thousand, nine hundred ninety-seven".