11861901 has 6 divisors (see below), whose sum is σ = 17133870. Its totient is φ = 7907928.

The previous prime is 11861887. The next prime is 11861917. The reversal of 11861901 is 10916811.

It can be written as a sum of positive squares in only one way, i.e., 6245001 + 5616900 = 2499^2 + 2370^2 .

It is not a de Polignac number, because 11861901 - 2¹¹ = 11859853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11861921) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 658986 + ... + 659003.

It is an arithmetic number, because the mean of its divisors is an integer number (2855645).

Almost surely, 2^11861901 is an apocalyptic number.

It is an amenable number.

11861901 is a deficient number, since it is larger than the sum of its proper divisors (5271969).

11861901 is a wasteful number, since it uses less digits than its factorization.

11861901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1317995 (or 1317992 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 27.

The square root of 11861901 is about 3444.1110609270. Note that the first 3 decimals coincide. The cubic root of 11861901 is about 228.0612139423.

The spelling of 11861901 in words is "eleven million, eight hundred sixty-one thousand, nine hundred one".