1930817191 has 2 divisors, whose sum is σ = 1930817192. Its totient is φ = 1930817190.

The previous prime is 1930817167. The next prime is 1930817209. The reversal of 1930817191 is 1917180391.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1930817191 - 2⁵ = 1930817159 is a prime.

It is a super-2 number, since 2×1930817191² = 7456110050122260962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1930817111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 965408595 + 965408596.

It is an arithmetic number, because the mean of its divisors is an integer number (965408596).

Almost surely, 2^1930817191 is an apocalyptic number.

1930817191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1930817191 is an equidigital number, since it uses as much as digits as its factorization.

1930817191 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1930817191 is about 43941.0649734391. The cubic root of 1930817191 is about 1245.2227664371. Note that the first 3 decimals are identical.

The spelling of 1930817191 in words is "one billion, nine hundred thirty million, eight hundred seventeen thousand, one hundred ninety-one".