3117531421 has 2 divisors, whose sum is σ = 3117531422. Its totient is φ = 3117531420.

The previous prime is 3117531323. The next prime is 3117531467. The reversal of 3117531421 is 1241357113.

3117531421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2242022500 + 875508921 = 47350^2 + 29589^2 .

It is a cyclic number.

It is not a de Polignac number, because 3117531421 - 2²⁵ = 3083976989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3117531421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3117531491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1558765710 + 1558765711.

It is an arithmetic number, because the mean of its divisors is an integer number (1558765711).

Almost surely, 2^3117531421 is an apocalyptic number.

It is an amenable number.

3117531421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3117531421 is an equidigital number, since it uses as much as digits as its factorization.

3117531421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 28.

The square root of 3117531421 is about 55834.8584756870. The cubic root of 3117531421 is about 1460.8432329451.

Adding to 3117531421 its reverse (1241357113), we get a palindrome (4358888534).

The spelling of 3117531421 in words is "three billion, one hundred seventeen million, five hundred thirty-one thousand, four hundred twenty-one".