31243331011 has 4 divisors (see below), whose sum is σ = 31552671024. Its totient is φ = 30933991000.

The previous prime is 31243331003. The next prime is 31243331039. The reversal of 31243331011 is 11013334213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31243331011 - 2³ = 31243331003 is a prime.

It is a super-2 number, since 2×31243331011² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31243331411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154669855 + ... + 154670056.

It is an arithmetic number, because the mean of its divisors is an integer number (7888167756).

Almost surely, 2^31243331011 is an apocalyptic number.

31243331011 is a deficient number, since it is larger than the sum of its proper divisors (309340013).

31243331011 is a wasteful number, since it uses less digits than its factorization.

31243331011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309340012.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 31243331011 its reverse (11013334213), we get a palindrome (42256665224).

The spelling of 31243331011 in words is "thirty-one billion, two hundred forty-three million, three hundred thirty-one thousand, eleven".