1242149669 has 2 divisors, whose sum is σ = 1242149670. Its totient is φ = 1242149668.

The previous prime is 1242149651. The next prime is 1242149683. The reversal of 1242149669 is 9669412421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1106427169 + 135722500 = 33263^2 + 11650^2 .

It is an emirp because it is prime and its reverse (9669412421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1242149669 - 2⁸ = 1242149413 is a prime.

It is a super-2 number, since 2×1242149669² = 3085871600393619122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242149269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621074834 + 621074835.

It is an arithmetic number, because the mean of its divisors is an integer number (621074835).

Almost surely, 2^1242149669 is an apocalyptic number.

It is an amenable number.

1242149669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242149669 is an equidigital number, since it uses as much as digits as its factorization.

1242149669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 44.

The square root of 1242149669 is about 35244.1437546722. The cubic root of 1242149669 is about 1074.9575376053.

The spelling of 1242149669 in words is "one billion, two hundred forty-two million, one hundred forty-nine thousand, six hundred sixty-nine".