191973206139 has 48 divisors (see below), whose sum is σ = 312119553024. Its totient is φ = 103933065600.

The previous prime is 191973206137. The next prime is 191973206149. The reversal of 191973206139 is 931602379191.

It is not a de Polignac number, because 191973206139 - 2¹ = 191973206137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 191973206091 and 191973206100.

It is not an unprimeable number, because it can be changed into a prime (191973206137) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 382312 + ... + 728085.

It is an arithmetic number, because the mean of its divisors is an integer number (6502490688).

Almost surely, 2^191973206139 is an apocalyptic number.

191973206139 is a deficient number, since it is larger than the sum of its proper divisors (120146346885).

191973206139 is a wasteful number, since it uses less digits than its factorization.

191973206139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110468 (or 1110455 counting only the distinct ones).

The product of its (nonzero) digits is 551124, while the sum is 51.

The spelling of 191973206139 in words is "one hundred ninety-one billion, nine hundred seventy-three million, two hundred six thousand, one hundred thirty-nine".