11720971 has 4 divisors (see below), whose sum is σ = 12037792. Its totient is φ = 11404152.

The previous prime is 11720903. The next prime is 11720977. The reversal of 11720971 is 17902711.

11720971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11720971 - 2¹¹ = 11718923 is a prime.

It is a super-2 number, since 2×11720971² = 274762322365682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11720977) 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, 158355 + ... + 158428.

It is an arithmetic number, because the mean of its divisors is an integer number (3009448).

Almost surely, 2^11720971 is an apocalyptic number.

11720971 is a deficient number, since it is larger than the sum of its proper divisors (316821).

11720971 is an equidigital number, since it uses as much as digits as its factorization.

11720971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316820.

The product of its (nonzero) digits is 882, while the sum is 28.

The square root of 11720971 is about 3423.5903668517. The cubic root of 11720971 is about 227.1544227970.

The spelling of 11720971 in words is "eleven million, seven hundred twenty thousand, nine hundred seventy-one".