25031543261 has 2 divisors, whose sum is σ = 25031543262. Its totient is φ = 25031543260.

The previous prime is 25031543231. The next prime is 25031543263. The reversal of 25031543261 is 16234513052.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24768779161 + 262764100 = 157381^2 + 16210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25031543261 is a prime.

Together with 25031543263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25031543263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12515771630 + 12515771631.

It is an arithmetic number, because the mean of its divisors is an integer number (12515771631).

Almost surely, 2^25031543261 is an apocalyptic number.

It is an amenable number.

25031543261 is a deficient number, since it is larger than the sum of its proper divisors (1).

25031543261 is an equidigital number, since it uses as much as digits as its factorization.

25031543261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 32.

The spelling of 25031543261 in words is "twenty-five billion, thirty-one million, five hundred forty-three thousand, two hundred sixty-one".