25309132531 has 2 divisors, whose sum is σ = 25309132532. Its totient is φ = 25309132530.

The previous prime is 25309132529. The next prime is 25309132553. The reversal of 25309132531 is 13523190352.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25309132531 - 2¹ = 25309132529 is a prime.

It is a super-2 number, since 2×25309132531² (a number of 22 digits) contains 22 as substring.

Together with 25309132529, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25309132031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12654566265 + 12654566266.

It is an arithmetic number, because the mean of its divisors is an integer number (12654566266).

Almost surely, 2^25309132531 is an apocalyptic number.

25309132531 is a deficient number, since it is larger than the sum of its proper divisors (1).

25309132531 is an equidigital number, since it uses as much as digits as its factorization.

25309132531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24300, while the sum is 34.

The spelling of 25309132531 in words is "twenty-five billion, three hundred nine million, one hundred thirty-two thousand, five hundred thirty-one".