1242852781 has 2 divisors, whose sum is σ = 1242852782. Its totient is φ = 1242852780.

The previous prime is 1242852691. The next prime is 1242852791. The reversal of 1242852781 is 1872582421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1197506025 + 45346756 = 34605^2 + 6734^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242852781 is a prime.

It is a super-2 number, since 2×1242852781² = 3089366070478867922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242852791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621426390 + 621426391.

It is an arithmetic number, because the mean of its divisors is an integer number (621426391).

Almost surely, 2^1242852781 is an apocalyptic number.

It is an amenable number.

1242852781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242852781 is an equidigital number, since it uses as much as digits as its factorization.

1242852781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 71680, while the sum is 40.

The square root of 1242852781 is about 35254.1172205460. The cubic root of 1242852781 is about 1075.1603239520.

The spelling of 1242852781 in words is "one billion, two hundred forty-two million, eight hundred fifty-two thousand, seven hundred eighty-one".