1065405217 has 4 divisors (see below), whose sum is σ = 1065499840. Its totient is φ = 1065310596.

The previous prime is 1065405203. The next prime is 1065405233. The reversal of 1065405217 is 7125045601.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1065405217 is a prime.

It is a super-2 number, since 2×1065405217² = 2270176552821634178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1065405247) 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, 27717 + ... + 53842.

It is an arithmetic number, because the mean of its divisors is an integer number (266374960).

Almost surely, 2^1065405217 is an apocalyptic number.

It is an amenable number.

1065405217 is a deficient number, since it is larger than the sum of its proper divisors (94623).

1065405217 is an equidigital number, since it uses as much as digits as its factorization.

1065405217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94622.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 1065405217 is about 32640.5455989939. The cubic root of 1065405217 is about 1021.3429756542.

The spelling of 1065405217 in words is "one billion, sixty-five million, four hundred five thousand, two hundred seventeen".