1242299551 has 2 divisors, whose sum is σ = 1242299552. Its totient is φ = 1242299550.

The previous prime is 1242299507. The next prime is 1242299557. The reversal of 1242299551 is 1559922421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1242299551 - 2⁹ = 1242299039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242299557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621149775 + 621149776.

It is an arithmetic number, because the mean of its divisors is an integer number (621149776).

Almost surely, 2^1242299551 is an apocalyptic number.

1242299551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242299551 is an equidigital number, since it uses as much as digits as its factorization.

1242299551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 40.

The square root of 1242299551 is about 35246.2700296074. The cubic root of 1242299551 is about 1075.0007718761. Note that the first 3 decimals are identical.

The spelling of 1242299551 in words is "one billion, two hundred forty-two million, two hundred ninety-nine thousand, five hundred fifty-one".