1581118046 has 4 divisors (see below), whose sum is σ = 2371677072. Its totient is φ = 790559022.

The previous prime is 1581118043. The next prime is 1581118051. The reversal of 1581118046 is 6408111851.

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

It is a junction number, because it is equal to n+sod(n) for n = 1581117997 and 1581118015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1581118043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 395279510 + ... + 395279513.

It is an arithmetic number, because the mean of its divisors is an integer number (592919268).

Almost surely, 2^1581118046 is an apocalyptic number.

1581118046 is a deficient number, since it is larger than the sum of its proper divisors (790559026).

1581118046 is an equidigital number, since it uses as much as digits as its factorization.

1581118046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790559025.

The product of its (nonzero) digits is 7680, while the sum is 35.

The square root of 1581118046 is about 39763.2750914710. The cubic root of 1581118046 is about 1164.9879461136.

Adding to 1581118046 its reverse (6408111851), we get a palindrome (7989229897).

The spelling of 1581118046 in words is "one billion, five hundred eighty-one million, one hundred eighteen thousand, forty-six".