25191401 has 4 divisors (see below), whose sum is σ = 26060100. Its totient is φ = 24322704.

The previous prime is 25191391. The next prime is 25191403. The reversal of 25191401 is 10419152.

It is a happy number.

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 11323225 + 13868176 = 3365^2 + 3724^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25191401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25191403) 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, 434306 + ... + 434363.

It is an arithmetic number, because the mean of its divisors is an integer number (6515025).

Almost surely, 2^25191401 is an apocalyptic number.

It is an amenable number.

25191401 is a deficient number, since it is larger than the sum of its proper divisors (868699).

25191401 is an equidigital number, since it uses as much as digits as its factorization.

25191401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868698.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 25191401 is about 5019.1036052267. The cubic root of 25191401 is about 293.1460907594.

The spelling of 25191401 in words is "twenty-five million, one hundred ninety-one thousand, four hundred one".