1990171183 has 16 divisors (see below), whose sum is σ = 2672119296. Its totient is φ = 1431491040.

The previous prime is 1990171171. The next prime is 1990171199. The reversal of 1990171183 is 3811710991.

It is a de Polignac number, because none of the positive numbers 2^k-1990171183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990171123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 993091 + ... + 995092.

It is an arithmetic number, because the mean of its divisors is an integer number (167007456).

Almost surely, 2^1990171183 is an apocalyptic number.

1990171183 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1990171183 is a deficient number, since it is larger than the sum of its proper divisors (681948113).

1990171183 is a wasteful number, since it uses less digits than its factorization.

1990171183 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1988214.

The product of its (nonzero) digits is 13608, while the sum is 40.

The square root of 1990171183 is about 44611.3346919816. The cubic root of 1990171183 is about 1257.8537374090.

The spelling of 1990171183 in words is "one billion, nine hundred ninety million, one hundred seventy-one thousand, one hundred eighty-three".