1431131021 has 2 divisors, whose sum is σ = 1431131022. Its totient is φ = 1431131020.

The previous prime is 1431131011. The next prime is 1431131041. The reversal of 1431131021 is 1201311341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 912885796 + 518245225 = 30214^2 + 22765^2 .

It is a cyclic number.

It is not a de Polignac number, because 1431131021 - 2¹⁸ = 1430868877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1431131011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 715565510 + 715565511.

It is an arithmetic number, because the mean of its divisors is an integer number (715565511).

Almost surely, 2^1431131021 is an apocalyptic number.

It is an amenable number.

1431131021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1431131021 is an equidigital number, since it uses as much as digits as its factorization.

1431131021 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 1431131021 is about 37830.2923726476. The cubic root of 1431131021 is about 1126.9201174121.

Adding to 1431131021 its reverse (1201311341), we get a palindrome (2632442362).

The spelling of 1431131021 in words is "one billion, four hundred thirty-one million, one hundred thirty-one thousand, twenty-one".