164710991 has 4 divisors (see below), whose sum is σ = 167169432. Its totient is φ = 162252552.

The previous prime is 164710963. The next prime is 164710993. The reversal of 164710991 is 199017461.

164710991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 164710991 - 2¹⁸ = 164448847 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 (164710993) 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, 1229120 + ... + 1229253.

It is an arithmetic number, because the mean of its divisors is an integer number (41792358).

Almost surely, 2^164710991 is an apocalyptic number.

164710991 is a deficient number, since it is larger than the sum of its proper divisors (2458441).

164710991 is an equidigital number, since it uses as much as digits as its factorization.

164710991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2458440.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 164710991 is about 12833.9779881376. The cubic root of 164710991 is about 548.1602340587.

The spelling of 164710991 in words is "one hundred sixty-four million, seven hundred ten thousand, nine hundred ninety-one".