1391104994 has 4 divisors (see below), whose sum is σ = 2086657494. Its totient is φ = 695552496.

The previous prime is 1391104993. The next prime is 1391104999. The reversal of 1391104994 is 4994011931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4994011931 = 47 ⋅106255573.

It can be written as a sum of positive squares in only one way, i.e., 1108024369 + 283080625 = 33287^2 + 16825^2 .

It is not an unprimeable number, because it can be changed into a prime (1391104991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347776247 + ... + 347776250.

Almost surely, 2^1391104994 is an apocalyptic number.

1391104994 is a deficient number, since it is larger than the sum of its proper divisors (695552500).

1391104994 is an equidigital number, since it uses as much as digits as its factorization.

1391104994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695552499.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 1391104994 is about 37297.5199443609. The cubic root of 1391104994 is about 1116.3146816466.

The spelling of 1391104994 in words is "one billion, three hundred ninety-one million, one hundred four thousand, nine hundred ninety-four".