1533055561 has 4 divisors (see below), whose sum is σ = 1533207312. Its totient is φ = 1532903812.

The previous prime is 1533055523. The next prime is 1533055577. The reversal of 1533055561 is 1655503351.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1655503351 = 281 ⋅5891471.

It is a cyclic number.

It is not a de Polignac number, because 1533055561 - 2¹⁵ = 1533022793 is a prime.

It is a super-2 number, since 2×1533055561² = 4700518706226049442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1533055861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59551 + ... + 81316.

It is an arithmetic number, because the mean of its divisors is an integer number (383301828).

Almost surely, 2^1533055561 is an apocalyptic number.

It is an amenable number.

1533055561 is a deficient number, since it is larger than the sum of its proper divisors (151751).

1533055561 is a wasteful number, since it uses less digits than its factorization.

1533055561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151750.

The product of its (nonzero) digits is 33750, while the sum is 34.

The square root of 1533055561 is about 39154.2534215633. The cubic root of 1533055561 is about 1153.0619249445.

The spelling of 1533055561 in words is "one billion, five hundred thirty-three million, fifty-five thousand, five hundred sixty-one".