1815982051 has 16 divisors (see below), whose sum is σ = 1979208000. Its totient is φ = 1656240768.

The previous prime is 1815982039. The next prime is 1815982073. The reversal of 1815982051 is 1502895181.

It is not a de Polignac number, because 1815982051 - 2⁹ = 1815981539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1815981995 and 1815982013.

It is not an unprimeable number, because it can be changed into a prime (1815982031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 379210 + ... + 383968.

It is an arithmetic number, because the mean of its divisors is an integer number (123700500).

Almost surely, 2^1815982051 is an apocalyptic number.

1815982051 is a deficient number, since it is larger than the sum of its proper divisors (163225949).

1815982051 is a wasteful number, since it uses less digits than its factorization.

1815982051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5118.

The product of its (nonzero) digits is 28800, while the sum is 40.

The square root of 1815982051 is about 42614.3409077273. The cubic root of 1815982051 is about 1220.0300205369.

The spelling of 1815982051 in words is "one billion, eight hundred fifteen million, nine hundred eighty-two thousand, fifty-one".