1005640253 has 4 divisors (see below), whose sum is σ = 1064795580. Its totient is φ = 946484928.

The previous prime is 1005640211. The next prime is 1005640261. The reversal of 1005640253 is 3520465001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 840826009 + 164814244 = 28997^2 + 12838^2 .

It is not a de Polignac number, because 1005640253 - 2¹² = 1005636157 is a prime.

It is a super-2 number, since 2×1005640253² = 2022624636907808018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005640283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29577638 + ... + 29577671.

It is an arithmetic number, because the mean of its divisors is an integer number (266198895).

Almost surely, 2^1005640253 is an apocalyptic number.

It is an amenable number.

1005640253 is a deficient number, since it is larger than the sum of its proper divisors (59155327).

1005640253 is an equidigital number, since it uses as much as digits as its factorization.

1005640253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59155326.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 1005640253 is about 31711.8314356014. The cubic root of 1005640253 is about 1001.8765606507.

The spelling of 1005640253 in words is "one billion, five million, six hundred forty thousand, two hundred fifty-three".