1992891001 has 8 divisors (see below), whose sum is σ = 2031936840. Its totient is φ = 1953898752.

The previous prime is 1992890917. The next prime is 1992891031. The reversal of 1992891001 is 1001982991.

It can be written as a sum of positive squares in 4 ways, for example, as 711608976 + 1281282025 = 26676^2 + 35795^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1992891001 - 2¹³ = 1992882809 is a prime.

It is a super-2 number, since 2×1992891001² = 7943229083733564002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1992891031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66291 + ... + 91543.

It is an arithmetic number, because the mean of its divisors is an integer number (253992105).

Almost surely, 2^1992891001 is an apocalyptic number.

It is an amenable number.

1992891001 is a deficient number, since it is larger than the sum of its proper divisors (39045839).

1992891001 is a wasteful number, since it uses less digits than its factorization.

1992891001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26795.

The product of its (nonzero) digits is 11664, while the sum is 40.

The square root of 1992891001 is about 44641.8077702953. The cubic root of 1992891001 is about 1258.4264814321.

The spelling of 1992891001 in words is "one billion, nine hundred ninety-two million, eight hundred ninety-one thousand, one".