129861233 has 4 divisors (see below), whose sum is σ = 131640228. Its totient is φ = 128082240.

The previous prime is 129861223. The next prime is 129861241. The reversal of 129861233 is 332168921.

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

It can be written as a sum of positive squares in 2 ways, for example, as 66308449 + 63552784 = 8143^2 + 7972^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129861233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129861193 and 129861202.

It is not an unprimeable number, because it can be changed into a prime (129861203) 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, 889388 + ... + 889533.

It is an arithmetic number, because the mean of its divisors is an integer number (32910057).

Almost surely, 2^129861233 is an apocalyptic number.

It is an amenable number.

129861233 is a deficient number, since it is larger than the sum of its proper divisors (1778995).

129861233 is an equidigital number, since it uses as much as digits as its factorization.

129861233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1778994.

The product of its digits is 15552, while the sum is 35.

The square root of 129861233 is about 11395.6672906855. The cubic root of 129861233 is about 506.3993901851.

The spelling of 129861233 in words is "one hundred twenty-nine million, eight hundred sixty-one thousand, two hundred thirty-three".