11621961 has 36 divisors (see below), whose sum is σ = 18917808. Its totient is φ = 7126704.

The previous prime is 11621957. The next prime is 11621989. The reversal of 11621961 is 16912611.

It is not a de Polignac number, because 11621961 - 2² = 11621957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

Its product of digits (648) is a multiple of the sum of its prime factors (324).

It is not an unprimeable number, because it can be changed into a prime (11621921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 40926 + ... + 41208.

Almost surely, 2^11621961 is an apocalyptic number.

It is an amenable number.

11621961 is a deficient number, since it is larger than the sum of its proper divisors (7295847).

11621961 is an equidigital number, since it uses as much as digits as its factorization.

11621961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324 (or 299 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 11621961 is about 3409.0997345340. The cubic root of 11621961 is about 226.5130030691.

The spelling of 11621961 in words is "eleven million, six hundred twenty-one thousand, nine hundred sixty-one".