1212229901 has 2 divisors, whose sum is σ = 1212229902. Its totient is φ = 1212229900.

The previous prime is 1212229891. The next prime is 1212229919. The reversal of 1212229901 is 1099222121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1179853801 + 32376100 = 34349^2 + 5690^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212229901 - 2¹⁴ = 1212213517 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212229951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606114950 + 606114951.

It is an arithmetic number, because the mean of its divisors is an integer number (606114951).

Almost surely, 2^1212229901 is an apocalyptic number.

It is an amenable number.

1212229901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212229901 is an equidigital number, since it uses as much as digits as its factorization.

1212229901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 1212229901 is about 34817.0920813327. The cubic root of 1212229901 is about 1066.2564321659.

The spelling of 1212229901 in words is "one billion, two hundred twelve million, two hundred twenty-nine thousand, nine hundred one".