320212981 has 16 divisors (see below), whose sum is σ = 362815488. Its totient is φ = 279975600.

The previous prime is 320212979. The next prime is 320212987. The reversal of 320212981 is 189212023.

It is a cyclic number.

It is not a de Polignac number, because 320212981 - 2¹ = 320212979 is a prime.

It is a super-2 number, since 2×320212981² = 205072706401812722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320212987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54136 + ... + 59758.

It is an arithmetic number, because the mean of its divisors is an integer number (22675968).

Almost surely, 2^320212981 is an apocalyptic number.

320212981 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

320212981 is a deficient number, since it is larger than the sum of its proper divisors (42602507).

320212981 is a wasteful number, since it uses less digits than its factorization.

320212981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5832.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 320212981 is about 17894.4958297237. The cubic root of 320212981 is about 684.1420918453.

The spelling of 320212981 in words is "three hundred twenty million, two hundred twelve thousand, nine hundred eighty-one".