31522123243 has 16 divisors (see below), whose sum is σ = 35327839680. Its totient is φ = 27925704576.

The previous prime is 31522123207. The next prime is 31522123247. The reversal of 31522123243 is 34232122513.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31522123243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31522123247) 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, 187380 + ... + 313297.

It is an arithmetic number, because the mean of its divisors is an integer number (2207989980).

Almost surely, 2^31522123243 is an apocalyptic number.

31522123243 is a deficient number, since it is larger than the sum of its proper divisors (3805716437).

31522123243 is a wasteful number, since it uses less digits than its factorization.

31522123243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500886.

The product of its digits is 8640, while the sum is 28.

Adding to 31522123243 its reverse (34232122513), we get a palindrome (65754245756).

The spelling of 31522123243 in words is "thirty-one billion, five hundred twenty-two million, one hundred twenty-three thousand, two hundred forty-three".