1242676549 has 2 divisors, whose sum is σ = 1242676550. Its totient is φ = 1242676548.

The previous prime is 1242676543. The next prime is 1242676597. The reversal of 1242676549 is 9456762421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1228853025 + 13823524 = 35055^2 + 3718^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242676549 - 2⁵ = 1242676517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1242676499 and 1242676508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242676543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621338274 + 621338275.

It is an arithmetic number, because the mean of its divisors is an integer number (621338275).

Almost surely, 2^1242676549 is an apocalyptic number.

It is an amenable number.

1242676549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242676549 is an equidigital number, since it uses as much as digits as its factorization.

1242676549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 46.

The square root of 1242676549 is about 35251.6176791931. The cubic root of 1242676549 is about 1075.1095036099.

It can be divided in two parts, 1242676 and 549, that added together give a square (1243225 = 1115²).

The spelling of 1242676549 in words is "one billion, two hundred forty-two million, six hundred seventy-six thousand, five hundred forty-nine".