1049811391 has 4 divisors (see below), whose sum is σ = 1049887984. Its totient is φ = 1049734800.

The previous prime is 1049811377. The next prime is 1049811401. The reversal of 1049811391 is 1931189401.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1049811391 - 2⁷ = 1049811263 is a prime.

It is a super-2 number, since 2×1049811391² = 2204207913346709762, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1049811391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1049811361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11475 + ... + 47236.

It is an arithmetic number, because the mean of its divisors is an integer number (262471996).

Almost surely, 2^1049811391 is an apocalyptic number.

1049811391 is a deficient number, since it is larger than the sum of its proper divisors (76593).

1049811391 is an equidigital number, since it uses as much as digits as its factorization.

1049811391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76592.

The product of its (nonzero) digits is 7776, while the sum is 37.

The square root of 1049811391 is about 32400.7930612817. The cubic root of 1049811391 is about 1016.3354955514.

The spelling of 1049811391 in words is "one billion, forty-nine million, eight hundred eleven thousand, three hundred ninety-one".