1242298861 has 2 divisors, whose sum is σ = 1242298862. Its totient is φ = 1242298860.

The previous prime is 1242298829. The next prime is 1242298873. The reversal of 1242298861 is 1688922421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 770062500 + 472236361 = 27750^2 + 21731^2 .

It is an emirp because it is prime and its reverse (1688922421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1242298861 - 2⁵ = 1242298829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242298891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621149430 + 621149431.

It is an arithmetic number, because the mean of its divisors is an integer number (621149431).

Almost surely, 2^1242298861 is an apocalyptic number.

It is an amenable number.

1242298861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242298861 is an equidigital number, since it uses as much as digits as its factorization.

1242298861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 43.

The square root of 1242298861 is about 35246.2602413362. The cubic root of 1242298861 is about 1075.0005728499. Note that the first 3 decimals are identical.

The spelling of 1242298861 in words is "one billion, two hundred forty-two million, two hundred ninety-eight thousand, eight hundred sixty-one".