71780212931 has 8 divisors (see below), whose sum is σ = 83779944960. Its totient is φ = 60216834888.

The previous prime is 71780212927. The next prime is 71780212957. The reversal of 71780212931 is 13921208717.

It is a happy number.

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

It is not a de Polignac number, because 71780212931 - 2² = 71780212927 is a prime.

It is a super-2 number, since 2×71780212931² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71780212901) 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 7 ways as a sum of consecutive naturals, for example, 109088141 + ... + 109088798.

It is an arithmetic number, because the mean of its divisors is an integer number (10472493120).

Almost surely, 2^71780212931 is an apocalyptic number.

71780212931 is a deficient number, since it is larger than the sum of its proper divisors (11999732029).

71780212931 is a wasteful number, since it uses less digits than its factorization.

71780212931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218176993.

The product of its (nonzero) digits is 42336, while the sum is 41.

The spelling of 71780212931 in words is "seventy-one billion, seven hundred eighty million, two hundred twelve thousand, nine hundred thirty-one".