25161901 has 2 divisors, whose sum is σ = 25161902. Its totient is φ = 25161900.

The previous prime is 25161893. The next prime is 25161911. The reversal of 25161901 is 10916152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22099401 + 3062500 = 4701^2 + 1750^2 .

It is a cyclic number.

It is not a de Polignac number, because 25161901 - 2³ = 25161893 is a prime.

It is equal to p_1575412 and since 25161901 and 1575412 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25161911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12580950 + 12580951.

It is an arithmetic number, because the mean of its divisors is an integer number (12580951).

Almost surely, 2^25161901 is an apocalyptic number.

It is an amenable number.

25161901 is a deficient number, since it is larger than the sum of its proper divisors (1).

25161901 is an equidigital number, since it uses as much as digits as its factorization.

25161901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 25161901 is about 5016.1639725990. The cubic root of 25161901 is about 293.0316180007.

It can be divided in two parts, 25161 and 901, that added together give a palindrome (26062).

The spelling of 25161901 in words is "twenty-five million, one hundred sixty-one thousand, nine hundred one".