26109931 has 2 divisors, whose sum is σ = 26109932. Its totient is φ = 26109930.

The previous prime is 26109929. The next prime is 26109953. The reversal of 26109931 is 13990162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26109931 - 2¹ = 26109929 is a prime.

It is a super-2 number, since 2×26109931² = 1363456993649522, which contains 22 as substring.

Together with 26109929, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 26109893 and 26109902.

It is not a weakly prime, because it can be changed into another prime (26109961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13054965 + 13054966.

It is an arithmetic number, because the mean of its divisors is an integer number (13054966).

Almost surely, 2^26109931 is an apocalyptic number.

26109931 is a deficient number, since it is larger than the sum of its proper divisors (1).

26109931 is an equidigital number, since it uses as much as digits as its factorization.

26109931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 26109931 is about 5109.7877646728. The cubic root of 26109931 is about 296.6665456101. Note that the first 3 decimals are identical.

The spelling of 26109931 in words is "twenty-six million, one hundred nine thousand, nine hundred thirty-one".