1811496987 has 12 divisors (see below), whose sum is σ = 2684026920. Its totient is φ = 1207517220.

The previous prime is 1811496961. The next prime is 1811497021. The reversal of 1811496987 is 7896941181.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

1811496987 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1811496987 - 2²⁰ = 1810448411 is a prime.

It is a super-3 number, since 3×1811496987³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1811496937) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 217062 + ... + 225252.

It is an arithmetic number, because the mean of its divisors is an integer number (223668910).

Almost surely, 2^1811496987 is an apocalyptic number.

1811496987 is a deficient number, since it is larger than the sum of its proper divisors (872529933).

1811496987 is an frugal number, since it uses more digits than its factorization.

1811496987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16391 (or 8194 counting only the distinct ones).

The product of its digits is 870912, while the sum is 54.

The square root of 1811496987 is about 42561.6844943900. The cubic root of 1811496987 is about 1219.0247933272.

The spelling of 1811496987 in words is "one billion, eight hundred eleven million, four hundred ninety-six thousand, nine hundred eighty-seven".