1212650261 has 2 divisors, whose sum is σ = 1212650262. Its totient is φ = 1212650260.

The previous prime is 1212650249. The next prime is 1212650269. The reversal of 1212650261 is 1620562121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 702568036 + 510082225 = 26506^2 + 22585^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212650261 - 2¹⁰ = 1212649237 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212650261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212650269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606325130 + 606325131.

It is an arithmetic number, because the mean of its divisors is an integer number (606325131).

Almost surely, 2^1212650261 is an apocalyptic number.

It is an amenable number.

1212650261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212650261 is an equidigital number, since it uses as much as digits as its factorization.

1212650261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1212650261 is about 34823.1282483352. The cubic root of 1212650261 is about 1066.3796650486.

The spelling of 1212650261 in words is "one billion, two hundred twelve million, six hundred fifty thousand, two hundred sixty-one".