1520730457 has 2 divisors, whose sum is σ = 1520730458. Its totient is φ = 1520730456.

The previous prime is 1520730443. The next prime is 1520730481. The reversal of 1520730457 is 7540370251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1507070041 + 13660416 = 38821^2 + 3696^2 .

It is a cyclic number.

It is not a de Polignac number, because 1520730457 - 2¹¹ = 1520728409 is a prime.

It is a super-2 number, since 2×1520730457² = 4625242245694857698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1520730857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760365228 + 760365229.

It is an arithmetic number, because the mean of its divisors is an integer number (760365229).

Almost surely, 2^1520730457 is an apocalyptic number.

It is an amenable number.

1520730457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1520730457 is an equidigital number, since it uses as much as digits as its factorization.

1520730457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29400, while the sum is 34.

The square root of 1520730457 is about 38996.5441674003. The cubic root of 1520730457 is about 1149.9635670878.

The spelling of 1520730457 in words is "one billion, five hundred twenty million, seven hundred thirty thousand, four hundred fifty-seven".