26157281 has 4 divisors (see below), whose sum is σ = 27534000. Its totient is φ = 24780564.

The previous prime is 26157253. The next prime is 26157289. The reversal of 26157281 is 18275162.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26157281 is a prime.

It is a super-2 number, since 2×26157281² = 1368406698625922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26157289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 688331 + ... + 688368.

It is an arithmetic number, because the mean of its divisors is an integer number (6883500).

Almost surely, 2^26157281 is an apocalyptic number.

It is an amenable number.

26157281 is a deficient number, since it is larger than the sum of its proper divisors (1376719).

26157281 is a wasteful number, since it uses less digits than its factorization.

26157281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1376718.

The product of its digits is 6720, while the sum is 32.

The square root of 26157281 is about 5114.4189308268. The cubic root of 26157281 is about 296.8457708767.

The spelling of 26157281 in words is "twenty-six million, one hundred fifty-seven thousand, two hundred eighty-one".