1922991871 has 2 divisors, whose sum is σ = 1922991872. Its totient is φ = 1922991870.

The previous prime is 1922991859. The next prime is 1922991883. The reversal of 1922991871 is 1781992291.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (1922991859) and next prime (1922991883).

It is a cyclic number.

It is not a de Polignac number, because 1922991871 - 2⁷ = 1922991743 is a prime.

It is a super-3 number, since 3×1922991871³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1922991841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 961495935 + 961495936.

It is an arithmetic number, because the mean of its divisors is an integer number (961495936).

Almost surely, 2^1922991871 is an apocalyptic number.

1922991871 is a deficient number, since it is larger than the sum of its proper divisors (1).

1922991871 is an equidigital number, since it uses as much as digits as its factorization.

1922991871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 49.

The square root of 1922991871 is about 43851.9312117494. The cubic root of 1922991871 is about 1243.5382533694.

The spelling of 1922991871 in words is "one billion, nine hundred twenty-two million, nine hundred ninety-one thousand, eight hundred seventy-one".