1038536561 has 4 divisors (see below), whose sum is σ = 1093196400. Its totient is φ = 983876724.

The previous prime is 1038536507. The next prime is 1038536563. The reversal of 1038536561 is 1656358301.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1656358301 = 13 ⋅127412177.

It is a cyclic number.

It is not a de Polignac number, because 1038536561 - 2⁶ = 1038536497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1038536563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27329891 + ... + 27329928.

It is an arithmetic number, because the mean of its divisors is an integer number (273299100).

Almost surely, 2^1038536561 is an apocalyptic number.

It is an amenable number.

1038536561 is a deficient number, since it is larger than the sum of its proper divisors (54659839).

1038536561 is an equidigital number, since it uses as much as digits as its factorization.

1038536561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54659838.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 1038536561 is about 32226.3333471247. Note that the first 4 decimals coincide. The cubic root of 1038536561 is about 1012.6839573492.

The spelling of 1038536561 in words is "one billion, thirty-eight million, five hundred thirty-six thousand, five hundred sixty-one".