1993391197 has 6 divisors (see below), whose sum is σ = 2318842878. Its totient is φ = 1708620984.

The previous prime is 1993391161. The next prime is 1993391203. The reversal of 1993391197 is 7911933991.

It can be written as a sum of positive squares in only one way, i.e., 1965237561 + 28153636 = 44331^2 + 5306^2 .

It is not a de Polignac number, because 1993391197 - 2⁷ = 1993391069 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 (1993391297) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20340678 + ... + 20340775.

It is an arithmetic number, because the mean of its divisors is an integer number (386473813).

Almost surely, 2^1993391197 is an apocalyptic number.

It is an amenable number.

1993391197 is a deficient number, since it is larger than the sum of its proper divisors (325451681).

1993391197 is an equidigital number, since it uses as much as digits as its factorization.

1993391197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40681467 (or 40681460 counting only the distinct ones).

The product of its digits is 413343, while the sum is 52.

The square root of 1993391197 is about 44647.4097456952. The cubic root of 1993391197 is about 1258.5317568396.

The spelling of 1993391197 in words is "one billion, nine hundred ninety-three million, three hundred ninety-one thousand, one hundred ninety-seven".