1212255251 has 2 divisors, whose sum is σ = 1212255252. Its totient is φ = 1212255250.

The previous prime is 1212255229. The next prime is 1212255263. The reversal of 1212255251 is 1525522121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212255251 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1212255251.

It is not a weakly prime, because it can be changed into another prime (1212255211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606127625 + 606127626.

It is an arithmetic number, because the mean of its divisors is an integer number (606127626).

Almost surely, 2^1212255251 is an apocalyptic number.

1212255251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212255251 is an equidigital number, since it uses as much as digits as its factorization.

1212255251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2000, while the sum is 26.

The square root of 1212255251 is about 34817.4561247659. The cubic root of 1212255251 is about 1066.2638645877.

Adding to 1212255251 its reverse (1525522121), we get a palindrome (2737777372).

The spelling of 1212255251 in words is "one billion, two hundred twelve million, two hundred fifty-five thousand, two hundred fifty-one".