129226247 has 4 divisors (see below), whose sum is σ = 129265416. Its totient is φ = 129187080.

The previous prime is 129226211. The next prime is 129226249. The reversal of 129226247 is 742622921.

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 129226247 - 2⁸ = 129225991 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 (129226249) 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, 14129 + ... + 21402.

It is an arithmetic number, because the mean of its divisors is an integer number (32316354).

Almost surely, 2^129226247 is an apocalyptic number.

129226247 is a deficient number, since it is larger than the sum of its proper divisors (39169).

129226247 is an equidigital number, since it uses as much as digits as its factorization.

129226247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39168.

The product of its digits is 24192, while the sum is 35.

The square root of 129226247 is about 11367.7722971566. The cubic root of 129226247 is about 505.5726562630.

The spelling of 129226247 in words is "one hundred twenty-nine million, two hundred twenty-six thousand, two hundred forty-seven".