1212391241 has 2 divisors, whose sum is σ = 1212391242. Its totient is φ = 1212391240.

The previous prime is 1212391211. The next prime is 1212391277. The reversal of 1212391241 is 1421932121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1099585600 + 112805641 = 33160^2 + 10621^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212391241 - 2¹⁸ = 1212129097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1212391241.

It is not a weakly prime, because it can be changed into another prime (1212391211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606195620 + 606195621.

It is an arithmetic number, because the mean of its divisors is an integer number (606195621).

Almost surely, 2^1212391241 is an apocalyptic number.

It is an amenable number.

1212391241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212391241 is an equidigital number, since it uses as much as digits as its factorization.

1212391241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 26.

The square root of 1212391241 is about 34819.4089697111. The cubic root of 1212391241 is about 1066.3037340242.

The spelling of 1212391241 in words is "one billion, two hundred twelve million, three hundred ninety-one thousand, two hundred forty-one".