25440091 has 2 divisors, whose sum is σ = 25440092. Its totient is φ = 25440090.

The previous prime is 25440083. The next prime is 25440167. The reversal of 25440091 is 19004452.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25440091 - 2³ = 25440083 is a prime.

It is equal to p_1591630 and since 25440091 and 1591630 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (25440011) 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, 12720045 + 12720046.

It is an arithmetic number, because the mean of its divisors is an integer number (12720046).

Almost surely, 2^25440091 is an apocalyptic number.

25440091 is a deficient number, since it is larger than the sum of its proper divisors (1).

25440091 is an equidigital number, since it uses as much as digits as its factorization.

25440091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 25440091 is about 5043.8171061211. The cubic root of 25440091 is about 294.1075816814.

The spelling of 25440091 in words is "twenty-five million, four hundred forty thousand, ninety-one".