1816612081 has 8 divisors (see below), whose sum is σ = 1858715424. Its totient is φ = 1774974240.

The previous prime is 1816612079. The next prime is 1816612117. The reversal of 1816612081 is 1802166181.

It is a happy number.

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 1816612081 - 2¹ = 1816612079 is a prime.

It is a super-2 number, since 2×1816612081² = 6600158905670301122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1816612481) 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, 108475 + ... + 124096.

It is an arithmetic number, because the mean of its divisors is an integer number (232339428).

Almost surely, 2^1816612081 is an apocalyptic number.

It is an amenable number.

1816612081 is a deficient number, since it is larger than the sum of its proper divisors (42103343).

1816612081 is a wasteful number, since it uses less digits than its factorization.

1816612081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232751.

The product of its (nonzero) digits is 4608, while the sum is 34.

The square root of 1816612081 is about 42621.7324964624. The cubic root of 1816612081 is about 1220.1710951030.

The spelling of 1816612081 in words is "one billion, eight hundred sixteen million, six hundred twelve thousand, eighty-one".