26121457 has 2 divisors, whose sum is σ = 26121458. Its totient is φ = 26121456.

The previous prime is 26121439. The next prime is 26121461. The reversal of 26121457 is 75412162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22572001 + 3549456 = 4751^2 + 1884^2 .

It is a cyclic number.

It is not a de Polignac number, because 26121457 - 2²³ = 17732849 is a prime.

It is not a weakly prime, because it can be changed into another prime (26121467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13060728 + 13060729.

It is an arithmetic number, because the mean of its divisors is an integer number (13060729).

Almost surely, 2^26121457 is an apocalyptic number.

It is an amenable number.

26121457 is a deficient number, since it is larger than the sum of its proper divisors (1).

26121457 is an equidigital number, since it uses as much as digits as its factorization.

26121457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 28.

The square root of 26121457 is about 5110.9154757245. The cubic root of 26121457 is about 296.7101928029.

The spelling of 26121457 in words is "twenty-six million, one hundred twenty-one thousand, four hundred fifty-seven".