113551 has 4 divisors (see below), whose sum is σ = 118512. Its totient is φ = 108592.

The previous prime is 113539. The next prime is 113557. The reversal of 113551 is 155311.

113551 = T₄₆ + T₄₇ + ... + T₉₁.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 113551 - 2⁹ = 113039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113557) 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, 2446 + ... + 2491.

It is an arithmetic number, because the mean of its divisors is an integer number (29628).

2¹¹³⁵⁵¹ is an apocalyptic number.

113551 is a deficient number, since it is larger than the sum of its proper divisors (4961).

113551 is an equidigital number, since it uses as much as digits as its factorization.

113551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4960.

The product of its digits is 75, while the sum is 16.

The square root of 113551 is about 336.9732927103. The cubic root of 113551 is about 48.4243337784.

Adding to 113551 its reverse (155311), we get a palindrome (268862).

The spelling of 113551 in words is "one hundred thirteen thousand, five hundred fifty-one".