3131020381 has 2 divisors, whose sum is σ = 3131020382. Its totient is φ = 3131020380.

The previous prime is 3131020289. The next prime is 3131020457. The reversal of 3131020381 is 1830201313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1901396025 + 1229624356 = 43605^2 + 35066^2 .

It is an emirp because it is prime and its reverse (1830201313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3131020381 - 2¹³ = 3131012189 is a prime.

It is a super-2 number, since 2×3131020381² = 19606577252474770322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3131020481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1565510190 + 1565510191.

It is an arithmetic number, because the mean of its divisors is an integer number (1565510191).

Almost surely, 2^3131020381 is an apocalyptic number.

It is an amenable number.

3131020381 is a deficient number, since it is larger than the sum of its proper divisors (1).

3131020381 is an equidigital number, since it uses as much as digits as its factorization.

3131020381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 3131020381 is about 55955.5214523107. The cubic root of 3131020381 is about 1462.9471308814.

Adding to 3131020381 its reverse (1830201313), we get a palindrome (4961221694).

The spelling of 3131020381 in words is "three billion, one hundred thirty-one million, twenty thousand, three hundred eighty-one".