26929681 has 2 divisors, whose sum is σ = 26929682. Its totient is φ = 26929680.

The previous prime is 26929633. The next prime is 26929697. The reversal of 26929681 is 18692962.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26010000 + 919681 = 5100^2 + 959^2 .

It is a cyclic number.

It is not a de Polignac number, because 26929681 - 2¹⁷ = 26798609 is a prime.

It is a super-2 number, since 2×26929681² = 1450415437523522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (26929181) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13464840 + 13464841.

It is an arithmetic number, because the mean of its divisors is an integer number (13464841).

Almost surely, 2^26929681 is an apocalyptic number.

It is an amenable number.

26929681 is a deficient number, since it is larger than the sum of its proper divisors (1).

26929681 is an equidigital number, since it uses as much as digits as its factorization.

26929681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 43.

The square root of 26929681 is about 5189.3815623829. The cubic root of 26929681 is about 299.7393328336.

The spelling of 26929681 in words is "twenty-six million, nine hundred twenty-nine thousand, six hundred eighty-one".