1523720449 has 2 divisors, whose sum is σ = 1523720450. Its totient is φ = 1523720448.

The previous prime is 1523720431. The next prime is 1523720467. The reversal of 1523720449 is 9440273251.

It is a balanced prime because it is at equal distance from previous prime (1523720431) and next prime (1523720467).

It can be written as a sum of positive squares in only one way, i.e., 1145145600 + 378574849 = 33840^2 + 19457^2 .

It is an emirp because it is prime and its reverse (9440273251) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1523720449 - 2⁹ = 1523719937 is a prime.

It is not a weakly prime, because it can be changed into another prime (1523720249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 761860224 + 761860225.

It is an arithmetic number, because the mean of its divisors is an integer number (761860225).

Almost surely, 2^1523720449 is an apocalyptic number.

It is an amenable number.

1523720449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1523720449 is an equidigital number, since it uses as much as digits as its factorization.

1523720449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 1523720449 is about 39034.8619697829. The cubic root of 1523720449 is about 1150.7167426082.

The spelling of 1523720449 in words is "one billion, five hundred twenty-three million, seven hundred twenty thousand, four hundred forty-nine".