25921031 has 4 divisors (see below), whose sum is σ = 25932432. Its totient is φ = 25909632.

The previous prime is 25920989. The next prime is 25921037. The reversal of 25921031 is 13012952.

It is a semiprime because it is the product of two primes, 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 25921031 - 2⁶ = 25920967 is a prime.

It is a super-2 number, since 2×25921031² = 1343799696205922, 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 = 25920988 and 25921006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25921037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 995 + ... + 7268.

It is an arithmetic number, because the mean of its divisors is an integer number (6483108).

Almost surely, 2^25921031 is an apocalyptic number.

25921031 is a deficient number, since it is larger than the sum of its proper divisors (11401).

25921031 is an equidigital number, since it uses as much as digits as its factorization.

25921031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11400.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 25921031 is about 5091.2700772990. The cubic root of 25921031 is about 295.9493727328.

Adding to 25921031 its reverse (13012952), we get a palindrome (38933983).

The spelling of 25921031 in words is "twenty-five million, nine hundred twenty-one thousand, thirty-one".