1553553231 has 8 divisors (see below), whose sum is σ = 2072024880. Its totient is φ = 1035391872.

The previous prime is 1553553217. The next prime is 1553553241. The reversal of 1553553231 is 1323553551.

It is a happy number.

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

It is not a de Polignac number, because 1553553231 - 2⁷ = 1553553103 is a prime.

It is a super-2 number, since 2×1553553231² = 4827055283101078722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1553553192 and 1553553201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1553553241) 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, 65626 + ... + 86103.

It is an arithmetic number, because the mean of its divisors is an integer number (259003110).

Almost surely, 2^1553553231 is an apocalyptic number.

1553553231 is a deficient number, since it is larger than the sum of its proper divisors (518471649).

1553553231 is a wasteful number, since it uses less digits than its factorization.

1553553231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155145.

The product of its digits is 33750, while the sum is 33.

The square root of 1553553231 is about 39415.1396166498. The cubic root of 1553553231 is about 1158.1781824365.

The spelling of 1553553231 in words is "one billion, five hundred fifty-three million, five hundred fifty-three thousand, two hundred thirty-one".