1005605057 has 4 divisors (see below), whose sum is σ = 1049327040. Its totient is φ = 961883076.

The previous prime is 1005605053. The next prime is 1005605087. The reversal of 1005605057 is 7505065001.

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.

It is a cyclic number.

It is not a de Polignac number, because 1005605057 - 2² = 1005605053 is a prime.

It is a super-2 number, since 2×1005605057² = 2022483061327946498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1005605053) 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, 21860957 + ... + 21861002.

It is an arithmetic number, because the mean of its divisors is an integer number (262331760).

Almost surely, 2^1005605057 is an apocalyptic number.

It is an amenable number.

1005605057 is a deficient number, since it is larger than the sum of its proper divisors (43721983).

1005605057 is an equidigital number, since it uses as much as digits as its factorization.

1005605057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43721982.

The product of its (nonzero) digits is 5250, while the sum is 29.

The square root of 1005605057 is about 31711.2764959091. The cubic root of 1005605057 is about 1001.8648724223.

The spelling of 1005605057 in words is "one billion, five million, six hundred five thousand, fifty-seven".