25442137 has 4 divisors (see below), whose sum is σ = 29076736. Its totient is φ = 21807540.

The previous prime is 25442119. The next prime is 25442161. The reversal of 25442137 is 73124452.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25442137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25442167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1817289 + ... + 1817302.

It is an arithmetic number, because the mean of its divisors is an integer number (7269184).

Almost surely, 2^25442137 is an apocalyptic number.

It is an amenable number.

25442137 is a deficient number, since it is larger than the sum of its proper divisors (3634599).

25442137 is an equidigital number, since it uses as much as digits as its factorization.

25442137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3634598.

The product of its digits is 6720, while the sum is 28.

The square root of 25442137 is about 5044.0199246236. The cubic root of 25442137 is about 294.1154659297.

Adding to 25442137 its reverse (73124452), we get a palindrome (98566589).

The spelling of 25442137 in words is "twenty-five million, four hundred forty-two thousand, one hundred thirty-seven".