266391129 has 32 divisors (see below), whose sum is σ = 389329920. Its totient is φ = 161485632.

The previous prime is 266391119. The next prime is 266391133. The reversal of 266391129 is 921193662.

It is not a de Polignac number, because 266391129 - 2⁴ = 266391113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (266391119) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 133074 + ... + 135060.

It is an arithmetic number, because the mean of its divisors is an integer number (12166560).

Almost surely, 2^266391129 is an apocalyptic number.

266391129 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

266391129 is a deficient number, since it is larger than the sum of its proper divisors (122938791).

266391129 is a wasteful number, since it uses less digits than its factorization.

266391129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2109.

The product of its digits is 34992, while the sum is 39.

The square root of 266391129 is about 16321.4928545155. The cubic root of 266391129 is about 643.4378227612.

The spelling of 266391129 in words is "two hundred sixty-six million, three hundred ninety-one thousand, one hundred twenty-nine".