1983357191 has 4 divisors (see below), whose sum is σ = 1993425192. Its totient is φ = 1973289192.

The previous prime is 1983357121. The next prime is 1983357193. The reversal of 1983357191 is 1917533891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1983357191 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 (1983357193) 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, 5033705 + ... + 5034098.

It is an arithmetic number, because the mean of its divisors is an integer number (498356298).

Almost surely, 2^1983357191 is an apocalyptic number.

1983357191 is a deficient number, since it is larger than the sum of its proper divisors (10068001).

1983357191 is a wasteful number, since it uses less digits than its factorization.

1983357191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10068000.

The product of its digits is 204120, while the sum is 47.

The square root of 1983357191 is about 44534.8985740397. The cubic root of 1983357191 is about 1256.4165401314.

The spelling of 1983357191 in words is "one billion, nine hundred eighty-three million, three hundred fifty-seven thousand, one hundred ninety-one".