26129491 has 4 divisors (see below), whose sum is σ = 26497584. Its totient is φ = 25761400.

The previous prime is 26129483. The next prime is 26129501. The reversal of 26129491 is 19492162.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19492162 = 2 ⋅9746081.

It is a cyclic number.

It is not a de Polignac number, because 26129491 - 2³ = 26129483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26129291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183940 + ... + 184081.

It is an arithmetic number, because the mean of its divisors is an integer number (6624396).

Almost surely, 2^26129491 is an apocalyptic number.

26129491 is a deficient number, since it is larger than the sum of its proper divisors (368093).

26129491 is an equidigital number, since it uses as much as digits as its factorization.

26129491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368092.

The product of its digits is 7776, while the sum is 34.

The square root of 26129491 is about 5111.7013801669. The cubic root of 26129491 is about 296.7406087344.

The spelling of 26129491 in words is "twenty-six million, one hundred twenty-nine thousand, four hundred ninety-one".