1913618887 has 4 divisors (see below), whose sum is σ = 1915900560. Its totient is φ = 1911337216.

The previous prime is 1913618857. The next prime is 1913618897. The reversal of 1913618887 is 7888163191.

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

It is a cyclic number.

It is not a de Polignac number, because 1913618887 - 2¹¹ = 1913616839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1913618857) 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, 1139578 + ... + 1141255.

It is an arithmetic number, because the mean of its divisors is an integer number (478975140).

Almost surely, 2^1913618887 is an apocalyptic number.

1913618887 is a deficient number, since it is larger than the sum of its proper divisors (2281673).

1913618887 is an equidigital number, since it uses as much as digits as its factorization.

1913618887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2281672.

The product of its digits is 580608, while the sum is 52.

The square root of 1913618887 is about 43744.9298433544. The cubic root of 1913618887 is about 1241.5145573788.

The spelling of 1913618887 in words is "one billion, nine hundred thirteen million, six hundred eighteen thousand, eight hundred eighty-seven".