25501381 has 2 divisors, whose sum is σ = 25501382. Its totient is φ = 25501380.

The previous prime is 25501369. The next prime is 25501391. The reversal of 25501381 is 18310552.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17850625 + 7650756 = 4225^2 + 2766^2 .

It is a cyclic number.

It is not a de Polignac number, because 25501381 - 2²¹ = 23404229 is a prime.

It is a super-2 number, since 2×25501381² = 1300640865814322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25501351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12750690 + 12750691.

It is an arithmetic number, because the mean of its divisors is an integer number (12750691).

Almost surely, 2^25501381 is an apocalyptic number.

It is an amenable number.

25501381 is a deficient number, since it is larger than the sum of its proper divisors (1).

25501381 is an equidigital number, since it uses as much as digits as its factorization.

25501381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 25501381 is about 5049.8892067054. The cubic root of 25501381 is about 294.3435792273.

The spelling of 25501381 in words is "twenty-five million, five hundred one thousand, three hundred eighty-one".