631131043 has 2 divisors, whose sum is σ = 631131044. Its totient is φ = 631131042.

The previous prime is 631131023. The next prime is 631131073. The reversal of 631131043 is 340131136.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 631131043 - 2⁹ = 631130531 is a prime.

It is not a weakly prime, because it can be changed into another prime (631131023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315565521 + 315565522.

It is an arithmetic number, because the mean of its divisors is an integer number (315565522).

Almost surely, 2^631131043 is an apocalyptic number.

631131043 is a deficient number, since it is larger than the sum of its proper divisors (1).

631131043 is an equidigital number, since it uses as much as digits as its factorization.

631131043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 631131043 is about 25122.3216084820. The cubic root of 631131043 is about 857.7745974339.

Adding to 631131043 its reverse (340131136), we get a palindrome (971262179).

The spelling of 631131043 in words is "six hundred thirty-one million, one hundred thirty-one thousand, forty-three".