26381531 has 4 divisors (see below), whose sum is σ = 28779864. Its totient is φ = 23983200.

The previous prime is 26381521. The next prime is 26381533. The reversal of 26381531 is 13518362.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26381531 is a prime.

It is a super-2 number, since 2×26381531² = 1391970355807922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26381494 and 26381503.

It is not an unprimeable number, because it can be changed into a prime (26381533) 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, 1199150 + ... + 1199171.

It is an arithmetic number, because the mean of its divisors is an integer number (7194966).

Almost surely, 2^26381531 is an apocalyptic number.

26381531 is a deficient number, since it is larger than the sum of its proper divisors (2398333).

26381531 is a wasteful number, since it uses less digits than its factorization.

26381531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2398332.

The product of its digits is 4320, while the sum is 29.

The square root of 26381531 is about 5136.2954548974. The cubic root of 26381531 is about 297.6916581556.

Adding to 26381531 its reverse (13518362), we get a palindrome (39899893).

The spelling of 26381531 in words is "twenty-six million, three hundred eighty-one thousand, five hundred thirty-one".