12695128031 has 4 divisors (see below), whose sum is σ = 12695602752. Its totient is φ = 12694653312.

The previous prime is 12695128013. The next prime is 12695128057. The reversal of 12695128031 is 13082159621.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 12695128031 - 2¹⁰ = 12695127007 is a prime.

It is a super-2 number, since 2×12695128031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12695128081) 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, 194690 + ... + 251583.

It is an arithmetic number, because the mean of its divisors is an integer number (3173900688).

Almost surely, 2^12695128031 is an apocalyptic number.

12695128031 is a deficient number, since it is larger than the sum of its proper divisors (474721).

12695128031 is an equidigital number, since it uses as much as digits as its factorization.

12695128031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474720.

The product of its (nonzero) digits is 25920, while the sum is 38.

The spelling of 12695128031 in words is "twelve billion, six hundred ninety-five million, one hundred twenty-eight thousand, thirty-one".