25405531 has 8 divisors (see below), whose sum is σ = 27241920. Its totient is φ = 23607168.

The previous prime is 25405519. The next prime is 25405571. The reversal of 25405531 is 13550452.

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

It is a cyclic number.

It is not a de Polignac number, because 25405531 - 2⁹ = 25405019 is a prime.

It is a super-2 number, since 2×25405531² = 1290882010783922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25405496 and 25405505.

It is not an unprimeable number, because it can be changed into a prime (25405511) 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, 8116 + ... + 10801.

It is an arithmetic number, because the mean of its divisors is an integer number (3405240).

Almost surely, 2^25405531 is an apocalyptic number.

25405531 is a deficient number, since it is larger than the sum of its proper divisors (1836389).

25405531 is a wasteful number, since it uses less digits than its factorization.

25405531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19013.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 25405531 is about 5040.3899650721. The cubic root of 25405531 is about 293.9743410127.

Adding to 25405531 its reverse (13550452), we get a palindrome (38955983).

The spelling of 25405531 in words is "twenty-five million, four hundred five thousand, five hundred thirty-one".