11312005 has 8 divisors (see below), whose sum is σ = 13607712. Its totient is φ = 9027408.

The previous prime is 11311999. The next prime is 11312009. The reversal of 11312005 is 50021311.

11312005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11312005 - 2³ = 11311997 is a prime.

It is a super-2 number, since 2×11312005² = 255922914240050, 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 (11312009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 339 + ... + 4768.

It is an arithmetic number, because the mean of its divisors is an integer number (1700964).

Almost surely, 2^11312005 is an apocalyptic number.

It is an amenable number.

11312005 is a deficient number, since it is larger than the sum of its proper divisors (2295707).

11312005 is an equidigital number, since it uses as much as digits as its factorization.

11312005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5555.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 11312005 is about 3363.3324248430. The cubic root of 11312005 is about 224.4811418627.

Adding to 11312005 its reverse (50021311), we get a palindrome (61333316).

It can be divided in two parts, 1131 and 2005, that added together give a square (3136 = 56²).

The spelling of 11312005 in words is "eleven million, three hundred twelve thousand, five".