113409521 has 2 divisors, whose sum is σ = 113409522. Its totient is φ = 113409520.

The previous prime is 113409511. The next prime is 113409523. The reversal of 113409521 is 125904311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83978896 + 29430625 = 9164^2 + 5425^2 .

It is a cyclic number.

It is not a de Polignac number, because 113409521 - 2¹⁰ = 113408497 is a prime.

Together with 113409523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (113409523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56704760 + 56704761.

It is an arithmetic number, because the mean of its divisors is an integer number (56704761).

Almost surely, 2^113409521 is an apocalyptic number.

It is an amenable number.

113409521 is a deficient number, since it is larger than the sum of its proper divisors (1).

113409521 is an equidigital number, since it uses as much as digits as its factorization.

113409521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 113409521 is about 10649.3906398441. The cubic root of 113409521 is about 484.0421396841.

The spelling of 113409521 in words is "one hundred thirteen million, four hundred nine thousand, five hundred twenty-one".