1231542210631 has 2 divisors, whose sum is σ = 1231542210632. Its totient is φ = 1231542210630.

The previous prime is 1231542210629. The next prime is 1231542210641. The reversal of 1231542210631 is 1360122451321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231542210631 - 2¹ = 1231542210629 is a prime.

It is a super-2 number, since 2×1231542210631² (a number of 25 digits) contains 22 as substring.

Together with 1231542210629, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1231542210593 and 1231542210602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231542210601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615771105315 + 615771105316.

It is an arithmetic number, because the mean of its divisors is an integer number (615771105316).

Almost surely, 2^{1231542210631} is an apocalyptic number.

1231542210631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231542210631 is an equidigital number, since it uses as much as digits as its factorization.

1231542210631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

Adding to 1231542210631 its reverse (1360122451321), we get a palindrome (2591664661952).

The spelling of 1231542210631 in words is "one trillion, two hundred thirty-one billion, five hundred forty-two million, two hundred ten thousand, six hundred thirty-one".