113521553 has 4 divisors (see below), whose sum is σ = 114623808. Its totient is φ = 112419300.

The previous prime is 113521489. The next prime is 113521607. The reversal of 113521553 is 355125311.

It is a happy number.

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: 355125311 = 5923 ⋅59957.

It is a cyclic number.

It is not a de Polignac number, because 113521553 - 2⁶ = 113521489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (113521153) 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, 550973 + ... + 551178.

It is an arithmetic number, because the mean of its divisors is an integer number (28655952).

Almost surely, 2^113521553 is an apocalyptic number.

It is an amenable number.

113521553 is a deficient number, since it is larger than the sum of its proper divisors (1102255).

113521553 is a wasteful number, since it uses less digits than its factorization.

113521553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102254.

The product of its digits is 2250, while the sum is 26.

The square root of 113521553 is about 10654.6493607251. The cubic root of 113521553 is about 484.2014748140.

Adding to 113521553 its reverse (355125311), we get a palindrome (468646864).

The spelling of 113521553 in words is "one hundred thirteen million, five hundred twenty-one thousand, five hundred fifty-three".