11956161 has 16 divisors (see below), whose sum is σ = 18366464. Its totient is φ = 6776784.

The previous prime is 11956121. The next prime is 11956177. The reversal of 11956161 is 16165911.

It is not a de Polignac number, because 11956161 - 2⁹ = 11955649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11956121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 426 + ... + 4908.

It is an arithmetic number, because the mean of its divisors is an integer number (1147904).

Almost surely, 2^11956161 is an apocalyptic number.

It is an amenable number.

11956161 is a deficient number, since it is larger than the sum of its proper divisors (6410303).

11956161 is a wasteful number, since it uses less digits than its factorization.

11956161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4620.

The product of its digits is 1620, while the sum is 30.

The square root of 11956161 is about 3457.7682108551. The cubic root of 11956161 is about 228.6637131634.

It can be divided in two parts, 119 and 56161, that added together give a triangular number (56280 = T₃₃₅).

The spelling of 11956161 in words is "eleven million, nine hundred fifty-six thousand, one hundred sixty-one".