1051272781 has 12 divisors (see below), whose sum is σ = 1153967988. Its totient is φ = 957101184.

The previous prime is 1051272779. The next prime is 1051272791. The reversal of 1051272781 is 1872721501.

It can be written as a sum of positive squares in 6 ways, for example, as 144720900 + 906551881 = 12030^2 + 30109^2 .

It is not a de Polignac number, because 1051272781 - 2¹ = 1051272779 is a prime.

It is a super-2 number, since 2×1051272781² = 2210348920142947922, 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 (1051272791) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30270 + ... + 54943.

It is an arithmetic number, because the mean of its divisors is an integer number (96163999).

Almost surely, 2^1051272781 is an apocalyptic number.

It is an amenable number.

1051272781 is a deficient number, since it is larger than the sum of its proper divisors (102695207).

1051272781 is an equidigital number, since it uses as much as digits as its factorization.

1051272781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85312 (or 85299 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 34.

The square root of 1051272781 is about 32423.3369812547. The cubic root of 1051272781 is about 1016.8068735178.

The spelling of 1051272781 in words is "one billion, fifty-one million, two hundred seventy-two thousand, seven hundred eighty-one".