1212551551 has 2 divisors, whose sum is σ = 1212551552. Its totient is φ = 1212551550.

The previous prime is 1212551533. The next prime is 1212551563. The reversal of 1212551551 is 1551552121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1212551551 - 2¹⁹ = 1212027263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212551521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606275775 + 606275776.

It is an arithmetic number, because the mean of its divisors is an integer number (606275776).

Almost surely, 2^1212551551 is an apocalyptic number.

1212551551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212551551 is an equidigital number, since it uses as much as digits as its factorization.

1212551551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2500, while the sum is 28.

The square root of 1212551551 is about 34821.7109143132. The cubic root of 1212551551 is about 1066.3507297498.

The spelling of 1212551551 in words is "one billion, two hundred twelve million, five hundred fifty-one thousand, five hundred fifty-one".