1993361187 has 18 divisors (see below), whose sum is σ = 2691328612. Its totient is φ = 1312358624.

The previous prime is 1993361179. The next prime is 1993361203. The reversal of 1993361187 is 7811633991.

It is not a de Polignac number, because 1993361187 - 2³ = 1993361179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1993361137) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11522233 + ... + 11522405.

Almost surely, 2^1993361187 is an apocalyptic number.

1993361187 is a deficient number, since it is larger than the sum of its proper divisors (697967425).

1993361187 is an frugal number, since it uses more digits than its factorization.

1993361187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647 (or 325 counting only the distinct ones).

The product of its digits is 244944, while the sum is 48.

The square root of 1993361187 is about 44647.0736667029. The cubic root of 1993361187 is about 1258.5254411822.

Multiplying 1993361187 by its sum of digits (48), we get a square (95681336976 = 309324²).

The spelling of 1993361187 in words is "one billion, nine hundred ninety-three million, three hundred sixty-one thousand, one hundred eighty-seven".