1005056161 has 4 divisors (see below), whose sum is σ = 1039713300. Its totient is φ = 970399024.

The previous prime is 1005056153. The next prime is 1005056251. The reversal of 1005056161 is 1616505001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1616505001 = 12197 ⋅132533.

It can be written as a sum of positive squares in 2 ways, for example, as 478078225 + 526977936 = 21865^2 + 22956^2 .

It is a cyclic number.

It is not a de Polignac number, because 1005056161 - 2³ = 1005056153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1005056111) 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, 17328526 + ... + 17328583.

It is an arithmetic number, because the mean of its divisors is an integer number (259928325).

Almost surely, 2^1005056161 is an apocalyptic number.

It is an amenable number.

1005056161 is a deficient number, since it is larger than the sum of its proper divisors (34657139).

1005056161 is an equidigital number, since it uses as much as digits as its factorization.

1005056161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34657138.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 1005056161 is about 31702.6207276307. The cubic root of 1005056161 is about 1001.6825544228.

The spelling of 1005056161 in words is "one billion, five million, fifty-six thousand, one hundred sixty-one".