1047457781 has 2 divisors, whose sum is σ = 1047457782. Its totient is φ = 1047457780.

The previous prime is 1047457777. The next prime is 1047457811. The reversal of 1047457781 is 1877547401.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 751308100 + 296149681 = 27410^2 + 17209^2 .

It is an emirp because it is prime and its reverse (1877547401) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1047457781 - 2² = 1047457777 is a prime.

It is a super-3 number, since 3×1047457781³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1047457751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 523728890 + 523728891.

It is an arithmetic number, because the mean of its divisors is an integer number (523728891).

Almost surely, 2^1047457781 is an apocalyptic number.

It is an amenable number.

1047457781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1047457781 is an equidigital number, since it uses as much as digits as its factorization.

1047457781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 219520, while the sum is 44.

The square root of 1047457781 is about 32364.4524285519. The cubic root of 1047457781 is about 1015.5754075174.

The spelling of 1047457781 in words is "one billion, forty-seven million, four hundred fifty-seven thousand, seven hundred eighty-one".