1931993061 has 4 divisors (see below), whose sum is σ = 2575990752. Its totient is φ = 1287995372.

The previous prime is 1931993057. The next prime is 1931993071. The reversal of 1931993061 is 1603991391.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1603991391 = 3 ⋅534663797.

It is a cyclic number.

It is not a de Polignac number, because 1931993061 - 2² = 1931993057 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1931993071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321998841 + ... + 321998846.

It is an arithmetic number, because the mean of its divisors is an integer number (643997688).

Almost surely, 2^1931993061 is an apocalyptic number.

It is an amenable number.

1931993061 is a deficient number, since it is larger than the sum of its proper divisors (643997691).

1931993061 is an equidigital number, since it uses as much as digits as its factorization.

1931993061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643997690.

The product of its (nonzero) digits is 39366, while the sum is 42.

The square root of 1931993061 is about 43954.4430177428. The cubic root of 1931993061 is about 1245.4754958625.

The spelling of 1931993061 in words is "one billion, nine hundred thirty-one million, nine hundred ninety-three thousand, sixty-one".