320631081 has 4 divisors (see below), whose sum is σ = 427508112. Its totient is φ = 213754052.

The previous prime is 320631071. The next prime is 320631083. The reversal of 320631081 is 180136023.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 320631081 - 2¹³ = 320622889 is a prime.

It is a super-2 number, since 2×320631081² = 205608580206457122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (320631083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53438511 + ... + 53438516.

It is an arithmetic number, because the mean of its divisors is an integer number (106877028).

Almost surely, 2^320631081 is an apocalyptic number.

It is an amenable number.

320631081 is a deficient number, since it is larger than the sum of its proper divisors (106877031).

320631081 is a wasteful number, since it uses less digits than its factorization.

320631081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106877030.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 320631081 is about 17906.1743820393. The cubic root of 320631081 is about 684.4397222999.

The spelling of 320631081 in words is "three hundred twenty million, six hundred thirty-one thousand, eighty-one".