71473749121 has 4 divisors (see below), whose sum is σ = 72129471700. Its totient is φ = 70818026544.

The previous prime is 71473749103. The next prime is 71473749157. The reversal of 71473749121 is 12194737417.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12194737417 = 331 ⋅36842107.

It can be written as a sum of positive squares in 2 ways, for example, as 34239801600 + 37233947521 = 185040^2 + 192961^2 .

It is a cyclic number.

It is not a de Polignac number, because 71473749121 - 2⁷ = 71473748993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71473749161) 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, 327861126 + ... + 327861343.

It is an arithmetic number, because the mean of its divisors is an integer number (18032367925).

Almost surely, 2^71473749121 is an apocalyptic number.

It is an amenable number.

71473749121 is a deficient number, since it is larger than the sum of its proper divisors (655722579).

71473749121 is a wasteful number, since it uses less digits than its factorization.

71473749121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655722578.

The product of its digits is 296352, while the sum is 46.

The spelling of 71473749121 in words is "seventy-one billion, four hundred seventy-three million, seven hundred forty-nine thousand, one hundred twenty-one".