1242156831413 has 2 divisors, whose sum is σ = 1242156831414. Its totient is φ = 1242156831412.

The previous prime is 1242156831379. The next prime is 1242156831469. The reversal of 1242156831413 is 3141386512421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 884656875844 + 357499955569 = 940562^2 + 597913^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242156831413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242156831493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621078415706 + 621078415707.

It is an arithmetic number, because the mean of its divisors is an integer number (621078415707).

Almost surely, 2^{1242156831413} is an apocalyptic number.

It is an amenable number.

1242156831413 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242156831413 is an equidigital number, since it uses as much as digits as its factorization.

1242156831413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 41.

The spelling of 1242156831413 in words is "one trillion, two hundred forty-two billion, one hundred fifty-six million, eight hundred thirty-one thousand, four hundred thirteen".