26816381 has 2 divisors, whose sum is σ = 26816382. Its totient is φ = 26816380.

The previous prime is 26816371. The next prime is 26816407. The reversal of 26816381 is 18361862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14100025 + 12716356 = 3755^2 + 3566^2 .

It is a cyclic number.

It is not a de Polignac number, because 26816381 - 2¹⁸ = 26554237 is a prime.

It is a super-2 number, since 2×26816381² = 1438236579874322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26816371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13408190 + 13408191.

It is an arithmetic number, because the mean of its divisors is an integer number (13408191).

Almost surely, 2^26816381 is an apocalyptic number.

It is an amenable number.

26816381 is a deficient number, since it is larger than the sum of its proper divisors (1).

26816381 is an equidigital number, since it uses as much as digits as its factorization.

26816381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 35.

The square root of 26816381 is about 5178.4535336334. The cubic root of 26816381 is about 299.3183821261.

The spelling of 26816381 in words is "twenty-six million, eight hundred sixteen thousand, three hundred eighty-one".