25111531243 has 4 divisors (see below), whose sum is σ = 25112081880. Its totient is φ = 25110980608.

The previous prime is 25111531219. The next prime is 25111531271. The reversal of 25111531243 is 34213511152.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25111531243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25111531043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200053 + ... + 300406.

It is an arithmetic number, because the mean of its divisors is an integer number (6278020470).

Almost surely, 2^25111531243 is an apocalyptic number.

25111531243 is a deficient number, since it is larger than the sum of its proper divisors (550637).

25111531243 is an equidigital number, since it uses as much as digits as its factorization.

25111531243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550636.

The product of its digits is 3600, while the sum is 28.

The spelling of 25111531243 in words is "twenty-five billion, one hundred eleven million, five hundred thirty-one thousand, two hundred forty-three".