1242854251 has 2 divisors, whose sum is σ = 1242854252. Its totient is φ = 1242854250.

The previous prime is 1242854237. The next prime is 1242854257. The reversal of 1242854251 is 1524582421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1242854251 - 2¹⁷ = 1242723179 is a prime.

It is not a weakly prime, because it can be changed into another prime (1242854257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621427125 + 621427126.

It is an arithmetic number, because the mean of its divisors is an integer number (621427126).

Almost surely, 2^1242854251 is an apocalyptic number.

1242854251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242854251 is an equidigital number, since it uses as much as digits as its factorization.

1242854251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25600, while the sum is 34.

The square root of 1242854251 is about 35254.1380691686. The cubic root of 1242854251 is about 1075.1607478384.

The spelling of 1242854251 in words is "one billion, two hundred forty-two million, eight hundred fifty-four thousand, two hundred fifty-one".