101553 has 4 divisors (see below), whose sum is σ = 135408. Its totient is φ = 67700.

The previous prime is 101537. The next prime is 101561. The reversal of 101553 is 355101.

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.

It is a cyclic number.

It is not a de Polignac number, because 101553 - 2⁴ = 101537 is a prime.

It is an Ulam number.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (101503) 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, 16923 + ... + 16928.

It is an arithmetic number, because the mean of its divisors is an integer number (33852).

2¹⁰¹⁵⁵³ is an apocalyptic number.

It is an amenable number.

101553 is a deficient number, since it is larger than the sum of its proper divisors (33855).

101553 is an equidigital number, since it uses as much as digits as its factorization.

101553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33854.

The product of its (nonzero) digits is 75, while the sum is 15.

The square root of 101553 is about 318.6738144247. The cubic root of 101553 is about 46.6549346926.

Adding to 101553 its reverse (355101), we get a palindrome (456654).

The spelling of 101553 in words is "one hundred one thousand, five hundred fifty-three".