1213662253 has 4 divisors (see below), whose sum is σ = 1216295388. Its totient is φ = 1211029120.

The previous prime is 1213662217. The next prime is 1213662299. The reversal of 1213662253 is 3522663121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3522663121 = 2297 ⋅1533593.

It can be written as a sum of positive squares in 2 ways, for example, as 329313609 + 884348644 = 18147^2 + 29738^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213662253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213662553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1315876 + ... + 1316797.

It is an arithmetic number, because the mean of its divisors is an integer number (304073847).

Almost surely, 2^1213662253 is an apocalyptic number.

It is an amenable number.

1213662253 is a deficient number, since it is larger than the sum of its proper divisors (2633135).

1213662253 is an equidigital number, since it uses as much as digits as its factorization.

1213662253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2633134.

The product of its digits is 12960, while the sum is 31.

The square root of 1213662253 is about 34837.6556760067. The cubic root of 1213662253 is about 1066.6762242091.

The spelling of 1213662253 in words is "one billion, two hundred thirteen million, six hundred sixty-two thousand, two hundred fifty-three".