11861001 has 12 divisors (see below), whose sum is σ = 17184960. Its totient is φ = 7883160.

The previous prime is 11860993. The next prime is 11861011. The reversal of 11861001 is 10016811.

11861001 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11861001 - 2³ = 11860993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11861011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1396 + ... + 5066.

It is an arithmetic number, because the mean of its divisors is an integer number (1432080).

Almost surely, 2^11861001 is an apocalyptic number.

It is an amenable number.

11861001 is a deficient number, since it is larger than the sum of its proper divisors (5323959).

11861001 is a wasteful number, since it uses less digits than its factorization.

11861001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4036 (or 4033 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

The square root of 11861001 is about 3443.9804006411. The cubic root of 11861001 is about 228.0554458875.

Adding to 11861001 its reverse (10016811), we get a palindrome (21877812).

It can be divided in two parts, 1186 and 1001, that added together give a 7-th power (2187 = 3⁷).

The spelling of 11861001 in words is "eleven million, eight hundred sixty-one thousand, one".