1211989253 has 2 divisors, whose sum is σ = 1211989254. Its totient is φ = 1211989252.

The previous prime is 1211989231. The next prime is 1211989327. The reversal of 1211989253 is 3529891121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 672727969 + 539261284 = 25937^2 + 23222^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211989253 - 2⁶ = 1211989189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211989253.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211989153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605994626 + 605994627.

It is an arithmetic number, because the mean of its divisors is an integer number (605994627).

Almost surely, 2^1211989253 is an apocalyptic number.

It is an amenable number.

1211989253 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211989253 is an equidigital number, since it uses as much as digits as its factorization.

1211989253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 41.

The square root of 1211989253 is about 34813.6360209617. The cubic root of 1211989253 is about 1066.1858708917.

The spelling of 1211989253 in words is "one billion, two hundred eleven million, nine hundred eighty-nine thousand, two hundred fifty-three".