1391591042 has 8 divisors (see below), whose sum is σ = 2159365500. Its totient is φ = 671802544.

The previous prime is 1391591021. The next prime is 1391591059. The reversal of 1391591042 is 2401951931.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1338169561 + 53421481 = 36581^2 + 7309^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1391590993 and 1391591011.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11996417 + ... + 11996532.

Almost surely, 2^1391591042 is an apocalyptic number.

1391591042 is a deficient number, since it is larger than the sum of its proper divisors (767774458).

1391591042 is a wasteful number, since it uses less digits than its factorization.

1391591042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23992980.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 1391591042 is about 37304.0351972813. The cubic root of 1391591042 is about 1116.4446788649. Note that the first 3 decimals are identical.

The spelling of 1391591042 in words is "one billion, three hundred ninety-one million, five hundred ninety-one thousand, forty-two".