1941541781 has 4 divisors (see below), whose sum is σ = 1944054252. Its totient is φ = 1939029312.

The previous prime is 1941541747. The next prime is 1941541783. The reversal of 1941541781 is 1871451491.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 155127025 + 1786414756 = 12455^2 + 42266^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1941541781 is a prime.

It is a super-2 number, since 2×1941541781² = 7539168974737303922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1941541783) 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, 1255076 + ... + 1256621.

It is an arithmetic number, because the mean of its divisors is an integer number (486013563).

Almost surely, 2^1941541781 is an apocalyptic number.

It is an amenable number.

1941541781 is a deficient number, since it is larger than the sum of its proper divisors (2512471).

1941541781 is an equidigital number, since it uses as much as digits as its factorization.

1941541781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2512470.

The product of its digits is 40320, while the sum is 41.

The square root of 1941541781 is about 44062.9297823011. The cubic root of 1941541781 is about 1247.5240121054.

The spelling of 1941541781 in words is "one billion, nine hundred forty-one million, five hundred forty-one thousand, seven hundred eighty-one".