1931973121 has 8 divisors (see below), whose sum is σ = 2083163264. Its totient is φ = 1781151120.

The previous prime is 1931973053. The next prime is 1931973133. The reversal of 1931973121 is 1213791391.

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

It is a cyclic number.

It is not a de Polignac number, because 1931973121 - 2¹¹ = 1931971073 is a prime.

It is a super-3 number, since 3×1931973121³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1931973161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81081 + ... + 102166.

It is an arithmetic number, because the mean of its divisors is an integer number (260395408).

Almost surely, 2^1931973121 is an apocalyptic number.

It is an amenable number.

1931973121 is a deficient number, since it is larger than the sum of its proper divisors (151190143).

1931973121 is a wasteful number, since it uses less digits than its factorization.

1931973121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184071.

The product of its digits is 10206, while the sum is 37.

The square root of 1931973121 is about 43954.2161913962. The cubic root of 1931973121 is about 1245.4712110185.

The spelling of 1931973121 in words is "one billion, nine hundred thirty-one million, nine hundred seventy-three thousand, one hundred twenty-one".