1918649311 has 4 divisors (see below), whose sum is σ = 1918741824. Its totient is φ = 1918556800.

The previous prime is 1918649297. The next prime is 1918649329. The reversal of 1918649311 is 1139468191.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 1918649311 - 2¹⁵ = 1918616543 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 (1918649371) 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, 831 + ... + 61951.

It is an arithmetic number, because the mean of its divisors is an integer number (479685456).

Almost surely, 2^1918649311 is an apocalyptic number.

1918649311 is a deficient number, since it is larger than the sum of its proper divisors (92513).

1918649311 is an equidigital number, since it uses as much as digits as its factorization.

1918649311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92512.

The product of its digits is 46656, while the sum is 43.

The square root of 1918649311 is about 43802.3893298071. The cubic root of 1918649311 is about 1242.6014822911.

The spelling of 1918649311 in words is "one billion, nine hundred eighteen million, six hundred forty-nine thousand, three hundred eleven".