26921731 has 2 divisors, whose sum is σ = 26921732. Its totient is φ = 26921730.

The previous prime is 26921723. The next prime is 26921747. The reversal of 26921731 is 13712962.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26921731 - 2³ = 26921723 is a prime.

It is a super-2 number, since 2×26921731² = 1449559200072722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 26921693 and 26921702.

It is not a weakly prime, because it can be changed into another prime (26921711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13460865 + 13460866.

It is an arithmetic number, because the mean of its divisors is an integer number (13460866).

Almost surely, 2^26921731 is an apocalyptic number.

26921731 is a deficient number, since it is larger than the sum of its proper divisors (1).

26921731 is an equidigital number, since it uses as much as digits as its factorization.

26921731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 31.

The square root of 26921731 is about 5188.6155186138. The cubic root of 26921731 is about 299.7098342514.

The spelling of 26921731 in words is "twenty-six million, nine hundred twenty-one thousand, seven hundred thirty-one".