189931650391 has 16 divisors (see below), whose sum is σ = 229877201664. Its totient is φ = 153192875904.

The previous prime is 189931650341. The next prime is 189931650409. The reversal of 189931650391 is 193056139981.

It is a cyclic number.

It is not a de Polignac number, because 189931650391 - 2⁷ = 189931650263 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 (189931650341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 483516 + ... + 783358.

It is an arithmetic number, because the mean of its divisors is an integer number (14367325104).

Almost surely, 2^189931650391 is an apocalyptic number.

189931650391 is a deficient number, since it is larger than the sum of its proper divisors (39945551273).

189931650391 is a wasteful number, since it uses less digits than its factorization.

189931650391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305190.

The product of its (nonzero) digits is 1574640, while the sum is 55.

The spelling of 189931650391 in words is "one hundred eighty-nine billion, nine hundred thirty-one million, six hundred fifty thousand, three hundred ninety-one".