1918089455 has 4 divisors (see below), whose sum is σ = 2301707352. Its totient is φ = 1534471560.

The previous prime is 1918089449. The next prime is 1918089473. The reversal of 1918089455 is 5549808191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5549808191 = 35221 ⋅157571.

It is a de Polignac number, because none of the positive numbers 2^k-1918089455 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191808941 + ... + 191808950.

It is an arithmetic number, because the mean of its divisors is an integer number (575426838).

Almost surely, 2^1918089455 is an apocalyptic number.

1918089455 is a deficient number, since it is larger than the sum of its proper divisors (383617897).

1918089455 is an equidigital number, since it uses as much as digits as its factorization.

1918089455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383617896.

The product of its (nonzero) digits is 518400, while the sum is 50.

The square root of 1918089455 is about 43795.9981619326. The cubic root of 1918089455 is about 1242.4806080962.

The spelling of 1918089455 in words is "one billion, nine hundred eighteen million, eighty-nine thousand, four hundred fifty-five".