25451989 has 4 divisors (see below), whose sum is σ = 25462080. Its totient is φ = 25441900.

The previous prime is 25451977. The next prime is 25451999. The reversal of 25451989 is 98915452.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25451989 - 2⁷ = 25451861 is a prime.

It is a super-2 number, since 2×25451989² = 1295607488112242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25451999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2514 + ... + 7564.

It is an arithmetic number, because the mean of its divisors is an integer number (6365520).

Almost surely, 2^25451989 is an apocalyptic number.

It is an amenable number.

25451989 is a deficient number, since it is larger than the sum of its proper divisors (10091).

25451989 is an equidigital number, since it uses as much as digits as its factorization.

25451989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10090.

The product of its digits is 129600, while the sum is 43.

The square root of 25451989 is about 5044.9964321097. The cubic root of 25451989 is about 294.1534246336.

The spelling of 25451989 in words is "twenty-five million, four hundred fifty-one thousand, nine hundred eighty-nine".