1648245581 has 2 divisors, whose sum is σ = 1648245582. Its totient is φ = 1648245580.

The previous prime is 1648245539. The next prime is 1648245587. The reversal of 1648245581 is 1855428461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1487336356 + 160909225 = 38566^2 + 12685^2 .

It is a cyclic number.

It is not a de Polignac number, because 1648245581 - 2⁶ = 1648245517 is a prime.

It is a super-2 number, since 2×1648245581² = 5433426990572055122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1648245587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824122790 + 824122791.

It is an arithmetic number, because the mean of its divisors is an integer number (824122791).

Almost surely, 2^1648245581 is an apocalyptic number.

It is an amenable number.

1648245581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1648245581 is an equidigital number, since it uses as much as digits as its factorization.

1648245581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 307200, while the sum is 44.

The square root of 1648245581 is about 40598.5908745612. The cubic root of 1648245581 is about 1181.2467864157.

The spelling of 1648245581 in words is "one billion, six hundred forty-eight million, two hundred forty-five thousand, five hundred eighty-one".