1242459661 has 2 divisors, whose sum is σ = 1242459662. Its totient is φ = 1242459660.

The previous prime is 1242459653. The next prime is 1242459677. The reversal of 1242459661 is 1669542421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1019524900 + 222934761 = 31930^2 + 14931^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242459661 - 2³ = 1242459653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242469661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621229830 + 621229831.

It is an arithmetic number, because the mean of its divisors is an integer number (621229831).

Almost surely, 2^1242459661 is an apocalyptic number.

It is an amenable number.

1242459661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242459661 is an equidigital number, since it uses as much as digits as its factorization.

1242459661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 40.

The square root of 1242459661 is about 35248.5412605969. The cubic root of 1242459661 is about 1075.0469526274.

The spelling of 1242459661 in words is "one billion, two hundred forty-two million, four hundred fifty-nine thousand, six hundred sixty-one".