25521441431 has 2 divisors, whose sum is σ = 25521441432. Its totient is φ = 25521441430.

The previous prime is 25521441427. The next prime is 25521441461. The reversal of 25521441431 is 13414412552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25521441431 - 2² = 25521441427 is a prime.

It is a super-2 number, since 2×25521441431² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25521441461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12760720715 + 12760720716.

It is an arithmetic number, because the mean of its divisors is an integer number (12760720716).

Almost surely, 2^25521441431 is an apocalyptic number.

25521441431 is a deficient number, since it is larger than the sum of its proper divisors (1).

25521441431 is an equidigital number, since it uses as much as digits as its factorization.

25521441431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19200, while the sum is 32.

Adding to 25521441431 its reverse (13414412552), we get a palindrome (38935853983).

The spelling of 25521441431 in words is "twenty-five billion, five hundred twenty-one million, four hundred forty-one thousand, four hundred thirty-one".