137511721117 has 4 divisors (see below), whose sum is σ = 137514812796. Its totient is φ = 137508629440.

The previous prime is 137511721103. The next prime is 137511721121. The reversal of 137511721117 is 711127115731.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13311159876 + 124200561241 = 115374^2 + 352421^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-137511721117 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 (137511721177) 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, 1478134 + ... + 1568407.

It is an arithmetic number, because the mean of its divisors is an integer number (34378703199).

Almost surely, 2^137511721117 is an apocalyptic number.

It is an amenable number.

137511721117 is a deficient number, since it is larger than the sum of its proper divisors (3091679).

137511721117 is an equidigital number, since it uses as much as digits as its factorization.

137511721117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3091678.

The product of its digits is 10290, while the sum is 37.

Adding to 137511721117 its reverse (711127115731), we get a palindrome (848638836848).

The spelling of 137511721117 in words is "one hundred thirty-seven billion, five hundred eleven million, seven hundred twenty-one thousand, one hundred seventeen".