1285548641 has 16 divisors (see below), whose sum is σ = 1437434880. Its totient is φ = 1141680960.

The previous prime is 1285548629. The next prime is 1285548643. The reversal of 1285548641 is 1468455821.

It is a cyclic number.

It is not a de Polignac number, because 1285548641 - 2⁶ = 1285548577 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1285548592 and 1285548601.

It is not an unprimeable number, because it can be changed into a prime (1285548643) 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 in 15 ways as a sum of consecutive naturals, for example, 60500 + ... + 78938.

It is an arithmetic number, because the mean of its divisors is an integer number (89839680).

Almost surely, 2^1285548641 is an apocalyptic number.

It is an amenable number.

1285548641 is a deficient number, since it is larger than the sum of its proper divisors (151886239).

1285548641 is a wasteful number, since it uses less digits than its factorization.

1285548641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18656.

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

The square root of 1285548641 is about 35854.5484004470. The cubic root of 1285548641 is about 1087.3336735278. Note that the first 3 decimals are identical.

The spelling of 1285548641 in words is "one billion, two hundred eighty-five million, five hundred forty-eight thousand, six hundred forty-one".