1816351949 has 8 divisors (see below), whose sum is σ = 1956414240. Its totient is φ = 1680736176.

The previous prime is 1816351931. The next prime is 1816351951. The reversal of 1816351949 is 9491536181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1816351949 - 2¹⁶ = 1816286413 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 (1816351919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1110782 + ... + 1112415.

It is an arithmetic number, because the mean of its divisors is an integer number (244551780).

Almost surely, 2^1816351949 is an apocalyptic number.

1816351949 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1816351949 is a deficient number, since it is larger than the sum of its proper divisors (140062291).

1816351949 is a wasteful number, since it uses less digits than its factorization.

1816351949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2223259.

The product of its digits is 233280, while the sum is 47.

The square root of 1816351949 is about 42618.6807515202. The cubic root of 1816351949 is about 1220.1128510228.

The spelling of 1816351949 in words is "one billion, eight hundred sixteen million, three hundred fifty-one thousand, nine hundred forty-nine".