25991401 has 2 divisors, whose sum is σ = 25991402. Its totient is φ = 25991400.

The previous prime is 25991387. The next prime is 25991437. The reversal of 25991401 is 10419952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25765776 + 225625 = 5076^2 + 475^2 .

It is a cyclic number.

It is not a de Polignac number, because 25991401 - 2⁹ = 25990889 is a prime.

It is not a weakly prime, because it can be changed into another prime (25991461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12995700 + 12995701.

It is an arithmetic number, because the mean of its divisors is an integer number (12995701).

Almost surely, 2^25991401 is an apocalyptic number.

It is an amenable number.

25991401 is a deficient number, since it is larger than the sum of its proper divisors (1).

25991401 is an equidigital number, since it uses as much as digits as its factorization.

25991401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 25991401 is about 5098.1762425401. The cubic root of 25991401 is about 296.2169436194.

The spelling of 25991401 in words is "twenty-five million, nine hundred ninety-one thousand, four hundred one".