31144728117 has 8 divisors (see below), whose sum is σ = 41698613440. Its totient is φ = 20676997440.

The previous prime is 31144728107. The next prime is 31144728143. The reversal of 31144728117 is 71182744113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31144728117 - 2¹¹ = 31144726069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31144728107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21537817 + ... + 21539262.

It is an arithmetic number, because the mean of its divisors is an integer number (5212326680).

Almost surely, 2^31144728117 is an apocalyptic number.

It is an amenable number.

31144728117 is a deficient number, since it is larger than the sum of its proper divisors (10553885323).

31144728117 is a wasteful number, since it uses less digits than its factorization.

31144728117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43077323.

The product of its digits is 37632, while the sum is 39.

The spelling of 31144728117 in words is "thirty-one billion, one hundred forty-four million, seven hundred twenty-eight thousand, one hundred seventeen".