1918837541 has 2 divisors, whose sum is σ = 1918837542. Its totient is φ = 1918837540.

The previous prime is 1918837517. The next prime is 1918837553. The reversal of 1918837541 is 1457388191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1871860225 + 46977316 = 43265^2 + 6854^2 .

It is a cyclic number.

It is not a de Polignac number, because 1918837541 - 2¹⁸ = 1918575397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1918837511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959418770 + 959418771.

It is an arithmetic number, because the mean of its divisors is an integer number (959418771).

Almost surely, 2^1918837541 is an apocalyptic number.

It is an amenable number.

1918837541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918837541 is an equidigital number, since it uses as much as digits as its factorization.

1918837541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 47.

The square root of 1918837541 is about 43804.5379041944. The cubic root of 1918837541 is about 1242.6421162981.

The spelling of 1918837541 in words is "one billion, nine hundred eighteen million, eight hundred thirty-seven thousand, five hundred forty-one".