1591170842 has 4 divisors (see below), whose sum is σ = 2386756266. Its totient is φ = 795585420.

The previous prime is 1591170817. The next prime is 1591170857. The reversal of 1591170842 is 2480711951.

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

It can be written as a sum of positive squares in only one way, i.e., 1160151721 + 431019121 = 34061^2 + 20761^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1591170796 and 1591170805.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 397792709 + ... + 397792712.

Almost surely, 2^1591170842 is an apocalyptic number.

1591170842 is a deficient number, since it is larger than the sum of its proper divisors (795585424).

1591170842 is an equidigital number, since it uses as much as digits as its factorization.

1591170842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795585423.

The product of its (nonzero) digits is 20160, while the sum is 38.

The square root of 1591170842 is about 39889.4828494930. The cubic root of 1591170842 is about 1167.4517412844.

The spelling of 1591170842 in words is "one billion, five hundred ninety-one million, one hundred seventy thousand, eight hundred forty-two".