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BaseRepresentation
bin10111001111101
3121022210
42321331
5340101
6131033
746461
oct27175
917283
1011901
118a3a
126a79
135556
1444a1
1537d6
hex2e7d

11901 has 4 divisors (see below), whose sum is σ = 15872. Its totient is φ = 7932.

The previous prime is 11897. The next prime is 11903. The reversal of 11901 is 10911.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10911 = 33637.

It is not a de Polignac number, because 11901 - 22 = 11897 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11903) 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, 1981 + ... + 1986.

It is an arithmetic number, because the mean of its divisors is an integer number (3968).

211901 is an apocalyptic number.

It is an amenable number.

11901 is a deficient number, since it is larger than the sum of its proper divisors (3971).

11901 is an equidigital number, since it uses as much as digits as its factorization.

11901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3970.

The product of its (nonzero) digits is 9, while the sum is 12.

The square root of 11901 is about 109.0917045426. The cubic root of 11901 is about 22.8311516318.

Subtracting from 11901 its reverse (10911), we obtain a triangular number (990 = T44).

The spelling of 11901 in words is "eleven thousand, nine hundred one".

Divisors: 1 3 3967 11901