1553113421 has 8 divisors (see below), whose sum is σ = 1646805240. Its totient is φ = 1459680768.

The previous prime is 1553113417. The next prime is 1553113469. The reversal of 1553113421 is 1243113551.

It can be written as a sum of positive squares in 4 ways, for example, as 345550921 + 1207562500 = 18589^2 + 34750^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1553113421 - 2² = 1553113417 is a prime.

It is a super-2 number, since 2×1553113421² = 4824322596980646482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1553113621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52376 + ... + 76481.

It is an arithmetic number, because the mean of its divisors is an integer number (205850655).

Almost surely, 2^1553113421 is an apocalyptic number.

It is an amenable number.

1553113421 is a deficient number, since it is larger than the sum of its proper divisors (93691819).

1553113421 is a wasteful number, since it uses less digits than its factorization.

1553113421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129583.

The product of its digits is 1800, while the sum is 26.

The square root of 1553113421 is about 39409.5600203808. The cubic root of 1553113421 is about 1158.0688789353.

Adding to 1553113421 its reverse (1243113551), we get a palindrome (2796226972).

The spelling of 1553113421 in words is "one billion, five hundred fifty-three million, one hundred thirteen thousand, four hundred twenty-one".