1211389253 has 16 divisors (see below), whose sum is σ = 1259855856. Its totient is φ = 1164134400.

The previous prime is 1211389219. The next prime is 1211389261. The reversal of 1211389253 is 3529831121.

It can be written as a sum of positive squares in 8 ways, for example, as 106956964 + 1104432289 = 10342^2 + 33233^2 .

It is not a de Polignac number, because 1211389253 - 2¹² = 1211385157 is a prime.

It is a super-3 number, since 3×1211389253³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211389453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 518075 + ... + 520407.

It is an arithmetic number, because the mean of its divisors is an integer number (78740991).

Almost surely, 2^1211389253 is an apocalyptic number.

It is an amenable number.

1211389253 is a deficient number, since it is larger than the sum of its proper divisors (48466603).

1211389253 is a wasteful number, since it uses less digits than its factorization.

1211389253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2584.

The product of its digits is 12960, while the sum is 35.

The square root of 1211389253 is about 34805.0176411390. The cubic root of 1211389253 is about 1066.0099020279.

The spelling of 1211389253 in words is "one billion, two hundred eleven million, three hundred eighty-nine thousand, two hundred fifty-three".