1212506651 has 2 divisors, whose sum is σ = 1212506652. Its totient is φ = 1212506650.

The previous prime is 1212506629. The next prime is 1212506671. The reversal of 1212506651 is 1566052121.

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-1212506651 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212506671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606253325 + 606253326.

It is an arithmetic number, because the mean of its divisors is an integer number (606253326).

Almost surely, 2^1212506651 is an apocalyptic number.

1212506651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212506651 is an equidigital number, since it uses as much as digits as its factorization.

1212506651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 1212506651 is about 34821.0661956236. The cubic root of 1212506651 is about 1066.3375674946.

Adding to 1212506651 its reverse (1566052121), we get a palindrome (2778558772).

The spelling of 1212506651 in words is "one billion, two hundred twelve million, five hundred six thousand, six hundred fifty-one".