1242151549 has 2 divisors, whose sum is σ = 1242151550. Its totient is φ = 1242151548.

The previous prime is 1242151517. The next prime is 1242151553. The reversal of 1242151549 is 9451512421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 661004100 + 581147449 = 25710^2 + 24107^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242151549 - 2⁵ = 1242151517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242151649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621075774 + 621075775.

It is an arithmetic number, because the mean of its divisors is an integer number (621075775).

Almost surely, 2^1242151549 is an apocalyptic number.

It is an amenable number.

1242151549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242151549 is an equidigital number, since it uses as much as digits as its factorization.

1242151549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 34.

The square root of 1242151549 is about 35244.1704257598. The cubic root of 1242151549 is about 1074.9580799229.

The spelling of 1242151549 in words is "one billion, two hundred forty-two million, one hundred fifty-one thousand, five hundred forty-nine".