1618461899 has 4 divisors (see below), whose sum is σ = 1674270960. Its totient is φ = 1562652840.

The previous prime is 1618461877. The next prime is 1618461913. The reversal of 1618461899 is 9981648161.

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 1618461899 - 2⁸ = 1618461643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1618461899.

It is not an unprimeable number, because it can be changed into a prime (1618461809) 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, 27904487 + ... + 27904544.

It is an arithmetic number, because the mean of its divisors is an integer number (418567740).

Almost surely, 2^1618461899 is an apocalyptic number.

1618461899 is a deficient number, since it is larger than the sum of its proper divisors (55809061).

1618461899 is an equidigital number, since it uses as much as digits as its factorization.

1618461899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55809060.

The product of its digits is 746496, while the sum is 53.

The square root of 1618461899 is about 40230.1118442393. Note that the first 3 decimals coincide. The cubic root of 1618461899 is about 1174.0884794789.

The spelling of 1618461899 in words is "one billion, six hundred eighteen million, four hundred sixty-one thousand, eight hundred ninety-nine".