25491157 has 2 divisors, whose sum is σ = 25491158. Its totient is φ = 25491156.

The previous prime is 25491139. The next prime is 25491163. The reversal of 25491157 is 75119452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14791716 + 10699441 = 3846^2 + 3271^2 .

It is a cyclic number.

It is not a de Polignac number, because 25491157 - 2¹¹ = 25489109 is a prime.

It is a plaindrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25491457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12745578 + 12745579.

It is an arithmetic number, because the mean of its divisors is an integer number (12745579).

Almost surely, 2^25491157 is an apocalyptic number.

It is an amenable number.

25491157 is a deficient number, since it is larger than the sum of its proper divisors (1).

25491157 is an equidigital number, since it uses as much as digits as its factorization.

25491157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 34.

The square root of 25491157 is about 5048.8768057856. The cubic root of 25491157 is about 294.3042379459.

The spelling of 25491157 in words is "twenty-five million, four hundred ninety-one thousand, one hundred fifty-seven".