1213343253 has 16 divisors (see below), whose sum is σ = 1827016000. Its totient is φ = 795633840.

The previous prime is 1213343239. The next prime is 1213343273. The reversal of 1213343253 is 3523433121.

1213343253 is a `hidden beast` number, since 1 + 2 + 1 + 334 + 325 + 3 = 666.

It is not a de Polignac number, because 1213343253 - 2⁴ = 1213343237 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213343203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 366703 + ... + 369996.

It is an arithmetic number, because the mean of its divisors is an integer number (114188500).

Almost surely, 2^1213343253 is an apocalyptic number.

It is an amenable number.

1213343253 is a deficient number, since it is larger than the sum of its proper divisors (613672747).

1213343253 is an equidigital number, since it uses as much as digits as its factorization.

1213343253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736769 (or 736763 counting only the distinct ones).

The product of its digits is 6480, while the sum is 27.

The square root of 1213343253 is about 34833.0769958670. The cubic root of 1213343253 is about 1066.5827606634.

Adding to 1213343253 its reverse (3523433121), we get a palindrome (4736776374).

The spelling of 1213343253 in words is "one billion, two hundred thirteen million, three hundred forty-three thousand, two hundred fifty-three".