1231542210439 has 2 divisors, whose sum is σ = 1231542210440. Its totient is φ = 1231542210438.

The previous prime is 1231542210427. The next prime is 1231542210443. The reversal of 1231542210439 is 9340122451321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1231542210439 - 2³⁵ = 1197182472071 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231542210398 and 1231542210407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231542210419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615771105219 + 615771105220.

It is an arithmetic number, because the mean of its divisors is an integer number (615771105220).

Almost surely, 2^{1231542210439} is an apocalyptic number.

1231542210439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231542210439 is an equidigital number, since it uses as much as digits as its factorization.

1231542210439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 1231542210439 in words is "one trillion, two hundred thirty-one billion, five hundred forty-two million, two hundred ten thousand, four hundred thirty-nine".