25081989 has 8 divisors (see below), whose sum is σ = 33466080. Its totient is φ = 16709616.

The previous prime is 25081963. The next prime is 25081999. The reversal of 25081989 is 98918052.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25081989 - 2¹⁵ = 25049221 is a prime.

It is a super-2 number, since 2×25081989² = 1258212344392242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25081989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25081909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5707 + ... + 9095.

It is an arithmetic number, because the mean of its divisors is an integer number (4183260).

Almost surely, 2^25081989 is an apocalyptic number.

It is an amenable number.

25081989 is a deficient number, since it is larger than the sum of its proper divisors (8384091).

25081989 is a wasteful number, since it uses less digits than its factorization.

25081989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5859.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 25081989 is about 5008.1921888043. The cubic root of 25081989 is about 292.7210747402.

The spelling of 25081989 in words is "twenty-five million, eighty-one thousand, nine hundred eighty-nine".