1231031141 has 2 divisors, whose sum is σ = 1231031142. Its totient is φ = 1231031140.

The previous prime is 1231031089. The next prime is 1231031203. The reversal of 1231031141 is 1411301321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 833188225 + 397842916 = 28865^2 + 19946^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231031141 - 2⁶ = 1231031077 is a prime.

It is a super-2 number, since 2×1231031141² = 3030875340223523762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231031741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615515570 + 615515571.

It is an arithmetic number, because the mean of its divisors is an integer number (615515571).

Almost surely, 2^1231031141 is an apocalyptic number.

It is an amenable number.

1231031141 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231031141 is an equidigital number, since it uses as much as digits as its factorization.

1231031141 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1231031141 is about 35086.0533688245. The cubic root of 1231031141 is about 1071.7405917603.

Adding to 1231031141 its reverse (1411301321), we get a palindrome (2642332462).

It can be divided in two parts, 1231031 and 141, that multiplied together give a palindrome (173575371).

The spelling of 1231031141 in words is "one billion, two hundred thirty-one million, thirty-one thousand, one hundred forty-one".