1918252041 has 4 divisors (see below), whose sum is σ = 2557669392. Its totient is φ = 1278834692.

The previous prime is 1918252019. The next prime is 1918252051. The reversal of 1918252041 is 1402528191.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1402528191 = 3 ⋅467509397.

It is a cyclic number.

It is not a de Polignac number, because 1918252041 - 2⁹ = 1918251529 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1918251993 and 1918252011.

It is not an unprimeable number, because it can be changed into a prime (1918252051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319708671 + ... + 319708676.

It is an arithmetic number, because the mean of its divisors is an integer number (639417348).

Almost surely, 2^1918252041 is an apocalyptic number.

It is an amenable number.

1918252041 is a deficient number, since it is larger than the sum of its proper divisors (639417351).

1918252041 is an equidigital number, since it uses as much as digits as its factorization.

1918252041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639417350.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 1918252041 is about 43797.8542967575. The cubic root of 1918252041 is about 1242.5157132098.

The spelling of 1918252041 in words is "one billion, nine hundred eighteen million, two hundred fifty-two thousand, forty-one".