123131025025 has 6 divisors (see below), whose sum is σ = 152682471062. Its totient is φ = 98504820000.

The previous prime is 123131024953. The next prime is 123131025071. The reversal of 123131025025 is 520520131321.

It can be written as a sum of positive squares in 3 ways, for example, as 43059570064 + 80071454961 = 207508^2 + 282969^2 .

It is a de Polignac number, because none of the positive numbers 2^k-123131025025 is a prime.

It is a super-2 number, since 2×123131025025² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 4925241001 = 123131025025 / (1 + 2 + 3 + 1 + 3 + 1 + 0 + 2 + 5 + 0 + 2 + 5).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2462620476 + ... + 2462620525.

Almost surely, 2^123131025025 is an apocalyptic number.

It is an amenable number.

123131025025 is a deficient number, since it is larger than the sum of its proper divisors (29551446037).

123131025025 is an equidigital number, since it uses as much as digits as its factorization.

123131025025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4925241011 (or 4925241006 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 123131025025 its reverse (520520131321), we get a palindrome (643651156346).

The spelling of 123131025025 in words is "one hundred twenty-three billion, one hundred thirty-one million, twenty-five thousand, twenty-five".