26161921 has 4 divisors (see below), whose sum is σ = 26306644. Its totient is φ = 26017200.

The previous prime is 26161907. The next prime is 26161937. The reversal of 26161921 is 12916162.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12390400 + 13771521 = 3520^2 + 3711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26161921 is a prime.

It is a super-2 number, since 2×26161921² = 1368892220820482, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26161921.

It is not an unprimeable number, because it can be changed into a prime (26161621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72090 + ... + 72451.

It is an arithmetic number, because the mean of its divisors is an integer number (6576661).

Almost surely, 2^26161921 is an apocalyptic number.

It is an amenable number.

26161921 is a deficient number, since it is larger than the sum of its proper divisors (144723).

26161921 is a wasteful number, since it uses less digits than its factorization.

26161921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144722.

The product of its digits is 1296, while the sum is 28.

The square root of 26161921 is about 5114.8725301810. The cubic root of 26161921 is about 296.8633221778.

The spelling of 26161921 in words is "twenty-six million, one hundred sixty-one thousand, nine hundred twenty-one".