1816942651 has 4 divisors (see below), whose sum is σ = 1817074600. Its totient is φ = 1816810704.

The previous prime is 1816942639. The next prime is 1816942663. The reversal of 1816942651 is 1562496181.

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

It is an interprime number because it is at equal distance from previous prime (1816942639) and next prime (1816942663).

It is a cyclic number.

It is not a de Polignac number, because 1816942651 - 2¹⁵ = 1816909883 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1816942598 and 1816942607.

It is not an unprimeable number, because it can be changed into a prime (1816942681) 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, 42546 + ... + 73783.

It is an arithmetic number, because the mean of its divisors is an integer number (454268650).

Almost surely, 2^1816942651 is an apocalyptic number.

1816942651 is a deficient number, since it is larger than the sum of its proper divisors (131949).

1816942651 is a wasteful number, since it uses less digits than its factorization.

1816942651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131948.

The product of its digits is 103680, while the sum is 43.

The square root of 1816942651 is about 42625.6102712911. The cubic root of 1816942651 is about 1220.2451023717.

The spelling of 1816942651 in words is "one billion, eight hundred sixteen million, nine hundred forty-two thousand, six hundred fifty-one".