26151561 has 12 divisors (see below), whose sum is σ = 37818820. Its totient is φ = 17413920.

The previous prime is 26151547. The next prime is 26151577. The reversal of 26151561 is 16515162.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4473225 + 21678336 = 2115^2 + 4656^2 .

It is not a de Polignac number, because 26151561 - 2⁶ = 26151497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (26151511) 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 11 ways as a sum of consecutive naturals, for example, 14151 + ... + 15891.

Almost surely, 2^26151561 is an apocalyptic number.

It is an amenable number.

26151561 is a deficient number, since it is larger than the sum of its proper divisors (11667259).

26151561 is a wasteful number, since it uses less digits than its factorization.

26151561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3416 (or 3413 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 26151561 is about 5113.8596969412. The cubic root of 26151561 is about 296.8241315023.

The spelling of 26151561 in words is "twenty-six million, one hundred fifty-one thousand, five hundred sixty-one".