1242312251 has 2 divisors, whose sum is σ = 1242312252. Its totient is φ = 1242312250.

The previous prime is 1242312233. The next prime is 1242312287. The reversal of 1242312251 is 1522132421.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242312251 is a prime.

It is not a weakly prime, because it can be changed into another prime (1242332251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621156125 + 621156126.

It is an arithmetic number, because the mean of its divisors is an integer number (621156126).

Almost surely, 2^1242312251 is an apocalyptic number.

1242312251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242312251 is an equidigital number, since it uses as much as digits as its factorization.

1242312251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 23.

The square root of 1242312251 is about 35246.4501900546. The cubic root of 1242312251 is about 1075.0044350998.

Adding to 1242312251 its reverse (1522132421), we get a palindrome (2764444672).

The spelling of 1242312251 in words is "one billion, two hundred forty-two million, three hundred twelve thousand, two hundred fifty-one".