1892992981 has 4 divisors (see below), whose sum is σ = 2065083264. Its totient is φ = 1720902700.

The previous prime is 1892992963. The next prime is 1892993017.

1892992981 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1892992981 - 2⁵ = 1892992949 is a prime.

It is a super-2 number, since 2×1892992981² = 7166844852230532722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1892992901) 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 3 ways as a sum of consecutive naturals, for example, 86045125 + ... + 86045146.

It is an arithmetic number, because the mean of its divisors is an integer number (516270816).

Almost surely, 2^1892992981 is an apocalyptic number.

1892992981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1892992981 is a deficient number, since it is larger than the sum of its proper divisors (172090283).

1892992981 is a wasteful number, since it uses less digits than its factorization.

1892992981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172090282.

The product of its digits is 1679616, while the sum is 58.

The square root of 1892992981 is about 43508.5391733623. The cubic root of 1892992981 is about 1237.0378874649.

The spelling of 1892992981 in words is "one billion, eight hundred ninety-two million, nine hundred ninety-two thousand, nine hundred eighty-one".