31012220231 has 8 divisors (see below), whose sum is σ = 32693735424. Its totient is φ = 29373275160.

The previous prime is 31012220221. The next prime is 31012220237. The reversal of 31012220231 is 13202221013.

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 31012220231 - 2⁶ = 31012220167 is a prime.

It is a super-2 number, since 2×31012220231² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31012220237) 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, 10641035 + ... + 10643948.

It is an arithmetic number, because the mean of its divisors is an integer number (4086716928).

Almost surely, 2^31012220231 is an apocalyptic number.

31012220231 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

31012220231 is a deficient number, since it is larger than the sum of its proper divisors (1681515193).

31012220231 is a wasteful number, since it uses less digits than its factorization.

31012220231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21285061.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 31012220231 its reverse (13202221013), we get a palindrome (44214441244).

The spelling of 31012220231 in words is "thirty-one billion, twelve million, two hundred twenty thousand, two hundred thirty-one".