113221729 has 4 divisors (see below), whose sum is σ = 114279984. Its totient is φ = 112163476.

The previous prime is 113221723. The next prime is 113221781. The reversal of 113221729 is 927122311.

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: 927122311 = 857 ⋅1081823.

It is a cyclic number.

It is not a de Polignac number, because 113221729 - 2³ = 113221721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 113221697 and 113221706.

It is not an unprimeable number, because it can be changed into a prime (113221721) 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, 528967 + ... + 529180.

It is an arithmetic number, because the mean of its divisors is an integer number (28569996).

Almost surely, 2^113221729 is an apocalyptic number.

It is an amenable number.

113221729 is a deficient number, since it is larger than the sum of its proper divisors (1058255).

113221729 is a wasteful number, since it uses less digits than its factorization.

113221729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058254.

The product of its digits is 1512, while the sum is 28.

The square root of 113221729 is about 10640.5699565390. The cubic root of 113221729 is about 483.7748209749.

The spelling of 113221729 in words is "one hundred thirteen million, two hundred twenty-one thousand, seven hundred twenty-nine".