164515951 has 4 divisors (see below), whose sum is σ = 164556432. Its totient is φ = 164475472.

The previous prime is 164515931. The next prime is 164515961. The reversal of 164515951 is 159515461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 164515951 - 2¹⁵ = 164483183 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 164515951.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164515921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13366 + ... + 22531.

It is an arithmetic number, because the mean of its divisors is an integer number (41139108).

Almost surely, 2^164515951 is an apocalyptic number.

164515951 is a deficient number, since it is larger than the sum of its proper divisors (40481).

164515951 is an equidigital number, since it uses as much as digits as its factorization.

164515951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40480.

The product of its digits is 27000, while the sum is 37.

The square root of 164515951 is about 12826.3771580287. The cubic root of 164515951 is about 547.9437834157.

The spelling of 164515951 in words is "one hundred sixty-four million, five hundred fifteen thousand, nine hundred fifty-one".