1243142203477 has 2 divisors, whose sum is σ = 1243142203478. Its totient is φ = 1243142203476.

The previous prime is 1243142203421. The next prime is 1243142203487. The reversal of 1243142203477 is 7743022413421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1082444644836 + 160697558641 = 1040406^2 + 400871^2 .

It is an emirp because it is prime and its reverse (7743022413421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1243142203477 - 2⁷ = 1243142203349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243142203417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621571101738 + 621571101739.

It is an arithmetic number, because the mean of its divisors is an integer number (621571101739).

Almost surely, 2^{1243142203477} is an apocalyptic number.

It is an amenable number.

1243142203477 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243142203477 is an equidigital number, since it uses as much as digits as its factorization.

1243142203477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225792, while the sum is 40.

Adding to 1243142203477 its reverse (7743022413421), we get a palindrome (8986164616898).

The spelling of 1243142203477 in words is "one trillion, two hundred forty-three billion, one hundred forty-two million, two hundred three thousand, four hundred seventy-seven".