1263535645 has 8 divisors (see below), whose sum is σ = 1526419800. Its totient is φ = 1004043840.

The previous prime is 1263535633. The next prime is 1263535649. The reversal of 1263535645 is 5465353621.

It can be written as a sum of positive squares in 4 ways, for example, as 870489 + 1262665156 = 933^2 + 35534^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1263535645 - 2¹³ = 1263527453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1263535598 and 1263535607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263535649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 847266 + ... + 848755.

It is an arithmetic number, because the mean of its divisors is an integer number (190802475).

Almost surely, 2^1263535645 is an apocalyptic number.

It is an amenable number.

1263535645 is a deficient number, since it is larger than the sum of its proper divisors (262884155).

1263535645 is a wasteful number, since it uses less digits than its factorization.

1263535645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1696175.

The product of its digits is 324000, while the sum is 40.

The square root of 1263535645 is about 35546.2465669724. The cubic root of 1263535645 is about 1081.0916160358.

The spelling of 1263535645 in words is "one billion, two hundred sixty-three million, five hundred thirty-five thousand, six hundred forty-five".