11661967 has 4 divisors (see below), whose sum is σ = 11692800. Its totient is φ = 11631136.

The previous prime is 11661959. The next prime is 11661971. The reversal of 11661967 is 76916611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76916611 = 31 ⋅2481181.

It is a cyclic number.

It is not a de Polignac number, because 11661967 - 2³ = 11661959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11661907) 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, 14842 + ... + 15607.

It is an arithmetic number, because the mean of its divisors is an integer number (2923200).

Almost surely, 2^11661967 is an apocalyptic number.

11661967 is a deficient number, since it is larger than the sum of its proper divisors (30833).

11661967 is an equidigital number, since it uses as much as digits as its factorization.

11661967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30832.

The product of its digits is 13608, while the sum is 37.

The square root of 11661967 is about 3414.9622252669. The cubic root of 11661967 is about 226.7726121893.

The spelling of 11661967 in words is "eleven million, six hundred sixty-one thousand, nine hundred sixty-seven".