11920871 has 2 divisors, whose sum is σ = 11920872. Its totient is φ = 11920870.

The previous prime is 11920837. The next prime is 11920897. The reversal of 11920871 is 17802911.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11920871 - 2⁶ = 11920807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11920801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5960435 + 5960436.

It is an arithmetic number, because the mean of its divisors is an integer number (5960436).

Almost surely, 2^11920871 is an apocalyptic number.

11920871 is a deficient number, since it is larger than the sum of its proper divisors (1).

11920871 is an equidigital number, since it uses as much as digits as its factorization.

11920871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 11920871 is about 3452.6614372104. The cubic root of 11920871 is about 228.4385156026.

The spelling of 11920871 in words is "eleven million, nine hundred twenty thousand, eight hundred seventy-one".