1457660821 has 2 divisors, whose sum is σ = 1457660822. Its totient is φ = 1457660820.

The previous prime is 1457660803. The next prime is 1457660839. The reversal of 1457660821 is 1280667541.

It is a balanced prime because it is at equal distance from previous prime (1457660803) and next prime (1457660839).

It can be written as a sum of positive squares in only one way, i.e., 1280637796 + 177023025 = 35786^2 + 13305^2 .

It is a cyclic number.

It is not a de Polignac number, because 1457660821 - 2¹⁹ = 1457136533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1457660851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 728830410 + 728830411.

It is an arithmetic number, because the mean of its divisors is an integer number (728830411).

Almost surely, 2^1457660821 is an apocalyptic number.

It is an amenable number.

1457660821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1457660821 is an equidigital number, since it uses as much as digits as its factorization.

1457660821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 1457660821 is about 38179.3245225737. The cubic root of 1457660821 is about 1133.8410082997.

The spelling of 1457660821 in words is "one billion, four hundred fifty-seven million, six hundred sixty thousand, eight hundred twenty-one".