1553043213 has 10 divisors (see below), whose sum is σ = 2319978254. Its totient is φ = 1035362088.

The previous prime is 1553043209. The next prime is 1553043221. The reversal of 1553043213 is 3123403551.

It can be written as a sum of positive squares in only one way, i.e., 1496297124 + 56746089 = 38682^2 + 7533^2 .

It is not a de Polignac number, because 1553043213 - 2² = 1553043209 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 (1553043203) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 9586606 + ... + 9586767.

Almost surely, 2^1553043213 is an apocalyptic number.

It is an amenable number.

1553043213 is a deficient number, since it is larger than the sum of its proper divisors (766935041).

1553043213 is an equidigital number, since it uses as much as digits as its factorization.

1553043213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19173385 (or 19173376 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 1553043213 is about 39408.6692619784. The cubic root of 1553043213 is about 1158.0514286268.

Adding to 1553043213 its reverse (3123403551), we get a palindrome (4676446764).

The spelling of 1553043213 in words is "one billion, five hundred fifty-three million, forty-three thousand, two hundred thirteen".