1591128042 has 16 divisors (see below), whose sum is σ = 3636864192. Its totient is φ = 454608000.

The previous prime is 1591128023. The next prime is 1591128047. The reversal of 1591128042 is 2408211951.

It is a junction number, because it is equal to n+sod(n) for n = 1591127994 and 1591128012.

It is not an unprimeable number, because it can be changed into a prime (1591128047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18941959 + ... + 18942042.

It is an arithmetic number, because the mean of its divisors is an integer number (227304012).

Almost surely, 2^1591128042 is an apocalyptic number.

1591128042 is an abundant number, since it is smaller than the sum of its proper divisors (2045736150).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1591128042 is a wasteful number, since it uses less digits than its factorization.

1591128042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37884013.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 1591128042 is about 39888.9463636231. The cubic root of 1591128042 is about 1167.4412736503.

Adding to 1591128042 its reverse (2408211951), we get a palindrome (3999339993).

The spelling of 1591128042 in words is "one billion, five hundred ninety-one million, one hundred twenty-eight thousand, forty-two".