164998991 has 8 divisors (see below), whose sum is σ = 174885120. Its totient is φ = 155132928.

The previous prime is 164998949. The next prime is 164998997. The reversal of 164998991 is 199899461.

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 164998991 - 2¹⁴ = 164982607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164998997) 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, 14015 + ... + 22943.

It is an arithmetic number, because the mean of its divisors is an integer number (21860640).

Almost surely, 2^164998991 is an apocalyptic number.

164998991 is a deficient number, since it is larger than the sum of its proper divisors (9886129).

164998991 is a wasteful number, since it uses less digits than its factorization.

164998991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10033.

The product of its digits is 1259712, while the sum is 56.

The square root of 164998991 is about 12845.1933033334. The cubic root of 164998991 is about 548.4795372269.

The spelling of 164998991 in words is "one hundred sixty-four million, nine hundred ninety-eight thousand, nine hundred ninety-one".