1918571441 has 4 divisors (see below), whose sum is σ = 1918681332. Its totient is φ = 1918461552.

The previous prime is 1918571437. The next prime is 1918571453. The reversal of 1918571441 is 1441758191.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1441758191 = 21871 ⋅65921.

It can be written as a sum of positive squares in 2 ways, for example, as 1053976225 + 864595216 = 32465^2 + 29404^2 .

It is a cyclic number.

It is not a de Polignac number, because 1918571441 - 2² = 1918571437 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1918571411) 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, 22286 + ... + 65831.

It is an arithmetic number, because the mean of its divisors is an integer number (479670333).

Almost surely, 2^1918571441 is an apocalyptic number.

It is an amenable number.

1918571441 is a deficient number, since it is larger than the sum of its proper divisors (109891).

1918571441 is an equidigital number, since it uses as much as digits as its factorization.

1918571441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109890.

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

The square root of 1918571441 is about 43801.5004423364. The cubic root of 1918571441 is about 1242.5846713874.

The spelling of 1918571441 in words is "one billion, nine hundred eighteen million, five hundred seventy-one thousand, four hundred forty-one".