31320020231 has 8 divisors (see below), whose sum is σ = 31549274064. Its totient is φ = 31091599360.

The previous prime is 31320020219. The next prime is 31320020243. The reversal of 31320020231 is 13202002313.

It is an interprime number because it is at equal distance from previous prime (31320020219) and next prime (31320020243).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31320020231 is a prime.

It is a super-2 number, since 2×31320020231² (a number of 22 digits) 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 (31320020131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132665 + ... + 283266.

It is an arithmetic number, because the mean of its divisors is an integer number (3943659258).

Almost surely, 2^31320020231 is an apocalyptic number.

31320020231 is a deficient number, since it is larger than the sum of its proper divisors (229253833).

31320020231 is a wasteful number, since it uses less digits than its factorization.

31320020231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416481.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 31320020231 its reverse (13202002313), we get a palindrome (44522022544).

The spelling of 31320020231 in words is "thirty-one billion, three hundred twenty million, twenty thousand, two hundred thirty-one".