1211242451 has 2 divisors, whose sum is σ = 1211242452. Its totient is φ = 1211242450.

The previous prime is 1211242441. The next prime is 1211242477. The reversal of 1211242451 is 1542421121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211242451 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211242411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605621225 + 605621226.

It is an arithmetic number, because the mean of its divisors is an integer number (605621226).

Almost surely, 2^1211242451 is an apocalyptic number.

1211242451 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211242451 is an equidigital number, since it uses as much as digits as its factorization.

1211242451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 640, while the sum is 23.

The square root of 1211242451 is about 34802.9086571798. The cubic root of 1211242451 is about 1065.9668388789.

Adding to 1211242451 its reverse (1542421121), we get a palindrome (2753663572).

The spelling of 1211242451 in words is "one billion, two hundred eleven million, two hundred forty-two thousand, four hundred fifty-one".