164837981 has 8 divisors (see below), whose sum is σ = 205512384. Its totient is φ = 128445120.

The previous prime is 164837971. The next prime is 164837983. The reversal of 164837981 is 189738461.

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 164837981 - 2¹⁸ = 164575837 is a prime.

It is a super-2 number, since 2×164837981² = 54343119960312722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164837983) 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, 1070300 + ... + 1070453.

It is an arithmetic number, because the mean of its divisors is an integer number (25689048).

Almost surely, 2^164837981 is an apocalyptic number.

164837981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

164837981 is a deficient number, since it is larger than the sum of its proper divisors (40674403).

164837981 is a wasteful number, since it uses less digits than its factorization.

164837981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2140771.

The product of its digits is 290304, while the sum is 47.

The square root of 164837981 is about 12838.9244487223. The cubic root of 164837981 is about 548.3010726384.

The spelling of 164837981 in words is "one hundred sixty-four million, eight hundred thirty-seven thousand, nine hundred eighty-one".