1018886401 has 4 divisors (see below), whose sum is σ = 1097262292. Its totient is φ = 940510512.

The previous prime is 1018886389. The next prime is 1018886411. The reversal of 1018886401 is 1046888101.

It is a Cunningham number, because it is equal to 31920²+1.

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

It can be written as a sum of positive squares in 2 ways, for example, as 150700176 + 868186225 = 12276^2 + 29465^2 .

It is a cyclic number.

It is not a de Polignac number, because 1018886401 - 2⁵ = 1018886369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1018886411) 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, 39187926 + ... + 39187951.

It is an arithmetic number, because the mean of its divisors is an integer number (274315573).

Almost surely, 2^1018886401 is an apocalyptic number.

It is an amenable number.

1018886401 is a deficient number, since it is larger than the sum of its proper divisors (78375891).

1018886401 is an equidigital number, since it uses as much as digits as its factorization.

1018886401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78375890.

The product of its (nonzero) digits is 12288, while the sum is 37.

The square root of 1018886401 is about 31920.0000156642. Note that the first 4 decimals coincide. The cubic root of 1018886401 is about 1006.2562447769.

The spelling of 1018886401 in words is "one billion, eighteen million, eight hundred eighty-six thousand, four hundred one".