1841991481 has 4 divisors (see below), whose sum is σ = 2009445264. Its totient is φ = 1674537700.

The previous prime is 1841991451. The next prime is 1841991581.

It is a happy number.

1841991481 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 a de Polignac number, because none of the positive numbers 2^k-1841991481 is a prime.

It is a super-2 number, since 2×1841991481² = 6785865232153146722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1841991451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83726875 + ... + 83726896.

It is an arithmetic number, because the mean of its divisors is an integer number (502361316).

Almost surely, 2^1841991481 is an apocalyptic number.

1841991481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1841991481 is a deficient number, since it is larger than the sum of its proper divisors (167453783).

1841991481 is a wasteful number, since it uses less digits than its factorization.

1841991481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167453782.

The product of its digits is 82944, while the sum is 46.

The square root of 1841991481 is about 42918.4282214528. The cubic root of 1841991481 is about 1225.8270646347.

The spelling of 1841991481 in words is "one billion, eight hundred forty-one million, nine hundred ninety-one thousand, four hundred eighty-one".