11971019 has 4 divisors (see below), whose sum is σ = 11992344. Its totient is φ = 11949696.

The previous prime is 11971013. The next prime is 11971033. The reversal of 11971019 is 91017911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91017911 = 677 ⋅134443.

It is a cyclic number.

It is not a de Polignac number, because 11971019 - 2¹⁶ = 11905483 is a prime.

It is a super-2 number, since 2×11971019² = 286610591796722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11970982 and 11971000.

It is not an unprimeable number, because it can be changed into a prime (11971013) 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, 9797 + ... + 10950.

It is an arithmetic number, because the mean of its divisors is an integer number (2998086).

Almost surely, 2^11971019 is an apocalyptic number.

11971019 is a deficient number, since it is larger than the sum of its proper divisors (21325).

11971019 is an equidigital number, since it uses as much as digits as its factorization.

11971019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21324.

The product of its (nonzero) digits is 567, while the sum is 29.

The square root of 11971019 is about 3459.9160394437. The cubic root of 11971019 is about 228.7583945878.

The spelling of 11971019 in words is "eleven million, nine hundred seventy-one thousand, nineteen".