1051748221 has 2 divisors, whose sum is σ = 1051748222. Its totient is φ = 1051748220.

The previous prime is 1051748213. The next prime is 1051748239. The reversal of 1051748221 is 1228471501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 985080996 + 66667225 = 31386^2 + 8165^2 .

It is a cyclic number.

It is not a de Polignac number, because 1051748221 - 2³ = 1051748213 is a prime.

It is a super-2 number, since 2×1051748221² = 2212348640753329682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1051748821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 525874110 + 525874111.

It is an arithmetic number, because the mean of its divisors is an integer number (525874111).

Almost surely, 2^1051748221 is an apocalyptic number.

It is an amenable number.

1051748221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1051748221 is an equidigital number, since it uses as much as digits as its factorization.

1051748221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 1051748221 is about 32430.6679086324. The cubic root of 1051748221 is about 1016.9601346597.

The spelling of 1051748221 in words is "one billion, fifty-one million, seven hundred forty-eight thousand, two hundred twenty-one".