71231903397 has 12 divisors (see below), whose sum is σ = 103142098540. Its totient is φ = 47371825728.

The previous prime is 71231903359. The next prime is 71231903489. The reversal of 71231903397 is 79330913217.

It is a happy number.

71231903397 is a `hidden beast` number, since 7 + 123 + 190 + 339 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 69635820996 + 1596082401 = 263886^2 + 39951^2 .

It is not a de Polignac number, because 71231903397 - 2²⁴ = 71215126181 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 (71231903597) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9671938 + ... + 9679299.

Almost surely, 2^71231903397 is an apocalyptic number.

It is an amenable number.

71231903397 is a deficient number, since it is larger than the sum of its proper divisors (31910195143).

71231903397 is a wasteful number, since it uses less digits than its factorization.

71231903397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19351652 (or 19351649 counting only the distinct ones).

The product of its (nonzero) digits is 214326, while the sum is 45.

The spelling of 71231903397 in words is "seventy-one billion, two hundred thirty-one million, nine hundred three thousand, three hundred ninety-seven".