3111252221531 has 2 divisors, whose sum is σ = 3111252221532. Its totient is φ = 3111252221530.

The previous prime is 3111252221437. The next prime is 3111252221549. The reversal of 3111252221531 is 1351222521113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3111252221531 - 2¹⁴ = 3111252205147 is a prime.

It is a super-2 number, since 2×3111252221531² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3111252221494 and 3111252221503.

It is not a weakly prime, because it can be changed into another prime (3111252221591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1555626110765 + 1555626110766.

It is an arithmetic number, because the mean of its divisors is an integer number (1555626110766).

Almost surely, 2^{3111252221531} is an apocalyptic number.

3111252221531 is a deficient number, since it is larger than the sum of its proper divisors (1).

3111252221531 is an equidigital number, since it uses as much as digits as its factorization.

3111252221531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 29.

Adding to 3111252221531 its reverse (1351222521113), we get a palindrome (4462474742644).

The spelling of 3111252221531 in words is "three trillion, one hundred eleven billion, two hundred fifty-two million, two hundred twenty-one thousand, five hundred thirty-one".