1049306781 has 4 divisors (see below), whose sum is σ = 1399075712. Its totient is φ = 699537852.

The previous prime is 1049306779. The next prime is 1049306801. The reversal of 1049306781 is 1876039401.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1876039401 = 3 ⋅625346467.

It is not a de Polignac number, because 1049306781 - 2¹ = 1049306779 is a prime.

It is a super-2 number, since 2×1049306781² = 2202089441305163922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1049306281) by changing a digit.

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, 174884461 + ... + 174884466.

It is an arithmetic number, because the mean of its divisors is an integer number (349768928).

Almost surely, 2^1049306781 is an apocalyptic number.

It is an amenable number.

1049306781 is a deficient number, since it is larger than the sum of its proper divisors (349768931).

1049306781 is an equidigital number, since it uses as much as digits as its factorization.

1049306781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349768930.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 1049306781 is about 32393.0051245635. The cubic root of 1049306781 is about 1016.1726297099.

The spelling of 1049306781 in words is "one billion, forty-nine million, three hundred six thousand, seven hundred eighty-one".