1553413321 has 4 divisors (see below), whose sum is σ = 1553866132. Its totient is φ = 1552960512.

The previous prime is 1553413297. The next prime is 1553413339. The reversal of 1553413321 is 1233143551.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50765625 + 1502647696 = 7125^2 + 38764^2 .

It is a cyclic number.

It is not a de Polignac number, because 1553413321 - 2¹³ = 1553405129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1553413321.

It is not an unprimeable number, because it can be changed into a prime (1553413621) 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, 221220 + ... + 228133.

It is an arithmetic number, because the mean of its divisors is an integer number (388466533).

Almost surely, 2^1553413321 is an apocalyptic number.

It is an amenable number.

1553413321 is a deficient number, since it is larger than the sum of its proper divisors (452811).

1553413321 is an equidigital number, since it uses as much as digits as its factorization.

1553413321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452810.

The product of its digits is 5400, while the sum is 28.

The square root of 1553413321 is about 39413.3647510587. The cubic root of 1553413321 is about 1158.1434136302.

Adding to 1553413321 its reverse (1233143551), we get a palindrome (2786556872).

The spelling of 1553413321 in words is "one billion, five hundred fifty-three million, four hundred thirteen thousand, three hundred twenty-one".