113509421 has 2 divisors, whose sum is σ = 113509422. Its totient is φ = 113509420.

The previous prime is 113509381. The next prime is 113509423. The reversal of 113509421 is 124905311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109956196 + 3553225 = 10486^2 + 1885^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-113509421 is a prime.

Together with 113509423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113509423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56754710 + 56754711.

It is an arithmetic number, because the mean of its divisors is an integer number (56754711).

Almost surely, 2^113509421 is an apocalyptic number.

It is an amenable number.

113509421 is a deficient number, since it is larger than the sum of its proper divisors (1).

113509421 is an equidigital number, since it uses as much as digits as its factorization.

113509421 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 113509421 is about 10654.0800165946. The cubic root of 113509421 is about 484.1842253977.

The spelling of 113509421 in words is "one hundred thirteen million, five hundred nine thousand, four hundred twenty-one".