11271905 has 8 divisors (see below), whose sum is σ = 13558632. Its totient is φ = 8995968.

The previous prime is 11271899. The next prime is 11271919. The reversal of 11271905 is 50917211.

It can be written as a sum of positive squares in 4 ways, for example, as 1957201 + 9314704 = 1399^2 + 3052^2 .

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 11271905 - 2²² = 7077601 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182 + ... + 4751.

It is an arithmetic number, because the mean of its divisors is an integer number (1694829).

Almost surely, 2^11271905 is an apocalyptic number.

It is an amenable number.

11271905 is a deficient number, since it is larger than the sum of its proper divisors (2286727).

11271905 is an equidigital number, since it uses as much as digits as its factorization.

11271905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5395.

The product of its (nonzero) digits is 630, while the sum is 26.

The square root of 11271905 is about 3357.3657828720. The cubic root of 11271905 is about 224.2155729234.

The spelling of 11271905 in words is "eleven million, two hundred seventy-one thousand, nine hundred five".