153561 has 8 divisors (see below), whose sum is σ = 216864. Its totient is φ = 96320.

The previous prime is 153557. The next prime is 153563. The reversal of 153561 is 165351.

It is a happy number.

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 153561 - 2² = 153557 is a prime.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (153563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1455 + ... + 1556.

It is an arithmetic number, because the mean of its divisors is an integer number (27108).

2¹⁵³⁵⁶¹ is an apocalyptic number.

It is an amenable number.

153561 is a deficient number, since it is larger than the sum of its proper divisors (63303).

153561 is a wasteful number, since it uses less digits than its factorization.

153561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3031.

The product of its digits is 450, while the sum is 21.

The square root of 153561 is about 391.8686004262. The cubic root of 153561 is about 53.5501030040.

It can be divided in two parts, 1535 and 61, that added together give a triangular number (1596 = T₅₆).

The spelling of 153561 in words is "one hundred fifty-three thousand, five hundred sixty-one".