1057651421 has 2 divisors, whose sum is σ = 1057651422. Its totient is φ = 1057651420.

The previous prime is 1057651391. The next prime is 1057651453. The reversal of 1057651421 is 1241567501.

It is an a-pointer prime, because the next prime (1057651453) can be obtained adding 1057651421 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 541725625 + 515925796 = 23275^2 + 22714^2 .

It is an emirp because it is prime and its reverse (1241567501) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1057651421 - 2¹⁰ = 1057650397 is a prime.

It is a super-2 number, since 2×1057651421² = 2237253056686638482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1057651471) 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, 528825710 + 528825711.

It is an arithmetic number, because the mean of its divisors is an integer number (528825711).

Almost surely, 2^1057651421 is an apocalyptic number.

It is an amenable number.

1057651421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1057651421 is an equidigital number, since it uses as much as digits as its factorization.

1057651421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 32.

The square root of 1057651421 is about 32521.5531763168. The cubic root of 1057651421 is about 1018.8592337437.

The spelling of 1057651421 in words is "one billion, fifty-seven million, six hundred fifty-one thousand, four hundred twenty-one".