71240531399 has 4 divisors (see below), whose sum is σ = 71269647264. Its totient is φ = 71211415536.

The previous prime is 71240531359. The next prime is 71240531431. The reversal of 71240531399 is 99313504217.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71240531399 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 (71240531309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14554262 + ... + 14559155.

It is an arithmetic number, because the mean of its divisors is an integer number (17817411816).

Almost surely, 2^71240531399 is an apocalyptic number.

71240531399 is a deficient number, since it is larger than the sum of its proper divisors (29115865).

71240531399 is a wasteful number, since it uses less digits than its factorization.

71240531399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29115864.

The product of its (nonzero) digits is 204120, while the sum is 44.

The spelling of 71240531399 in words is "seventy-one billion, two hundred forty million, five hundred thirty-one thousand, three hundred ninety-nine".