1242143011957 has 2 divisors, whose sum is σ = 1242143011958. Its totient is φ = 1242143011956.

The previous prime is 1242143011939. The next prime is 1242143012003. The reversal of 1242143011957 is 7591103412421.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1236397220356 + 5745791601 = 1111934^2 + 75801^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242143011957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242143011157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621071505978 + 621071505979.

It is an arithmetic number, because the mean of its divisors is an integer number (621071505979).

Almost surely, 2^{1242143011957} is an apocalyptic number.

It is an amenable number.

1242143011957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242143011957 is an equidigital number, since it uses as much as digits as its factorization.

1242143011957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 1242143011957 in words is "one trillion, two hundred forty-two billion, one hundred forty-three million, eleven thousand, nine hundred fifty-seven".