1211313653 has 16 divisors (see below), whose sum is σ = 1385482752. Its totient is φ = 1048278000.

The previous prime is 1211313641. The next prime is 1211313667. The reversal of 1211313653 is 3563131121.

It is not a de Polignac number, because 1211313653 - 2⁴ = 1211313637 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 (1211313613) 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, 42038 + ... + 64728.

It is an arithmetic number, because the mean of its divisors is an integer number (86592672).

Almost surely, 2^1211313653 is an apocalyptic number.

It is an amenable number.

1211313653 is a deficient number, since it is larger than the sum of its proper divisors (174169099).

1211313653 is a wasteful number, since it uses less digits than its factorization.

1211313653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22936.

The product of its digits is 1620, while the sum is 26.

The square root of 1211313653 is about 34803.9315738898. The cubic root of 1211313653 is about 1065.9877258295.

Adding to 1211313653 its reverse (3563131121), we get a palindrome (4774444774).

The spelling of 1211313653 in words is "one billion, two hundred eleven million, three hundred thirteen thousand, six hundred fifty-three".