11213312531 has 2 divisors, whose sum is σ = 11213312532. Its totient is φ = 11213312530.

The previous prime is 11213312503. The next prime is 11213312549. The reversal of 11213312531 is 13521331211.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11213312531 is a prime.

It is a super-2 number, since 2×11213312531² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11213312497 and 11213312506.

It is not a weakly prime, because it can be changed into another prime (11213312581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5606656265 + 5606656266.

It is an arithmetic number, because the mean of its divisors is an integer number (5606656266).

Almost surely, 2^11213312531 is an apocalyptic number.

11213312531 is a deficient number, since it is larger than the sum of its proper divisors (1).

11213312531 is an equidigital number, since it uses as much as digits as its factorization.

11213312531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 23.

Adding to 11213312531 its reverse (13521331211), we get a palindrome (24734643742).

The spelling of 11213312531 in words is "eleven billion, two hundred thirteen million, three hundred twelve thousand, five hundred thirty-one".