1553252321 has 8 divisors (see below), whose sum is σ = 1590864000. Its totient is φ = 1515708432.

The previous prime is 1553252279. The next prime is 1553252329. The reversal of 1553252321 is 1232523551.

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 1553252321 - 2¹⁸ = 1552990177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1553252329) 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, 31055 + ... + 63803.

It is an arithmetic number, because the mean of its divisors is an integer number (198858000).

Almost surely, 2^1553252321 is an apocalyptic number.

It is an amenable number.

1553252321 is a deficient number, since it is larger than the sum of its proper divisors (37611679).

1553252321 is a wasteful number, since it uses less digits than its factorization.

1553252321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33895.

The product of its digits is 9000, while the sum is 29.

The square root of 1553252321 is about 39411.3222437411. The cubic root of 1553252321 is about 1158.1034011988.

Adding to 1553252321 its reverse (1232523551), we get a palindrome (2785775872).

The spelling of 1553252321 in words is "one billion, five hundred fifty-three million, two hundred fifty-two thousand, three hundred twenty-one".