11651871 has 16 divisors (see below), whose sum is σ = 19369728. Its totient is φ = 6052800.

The previous prime is 11651867. The next prime is 11651873. The reversal of 11651871 is 17815611.

It is not a de Polignac number, because 11651871 - 2² = 11651867 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11651873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24990 + ... + 25451.

It is an arithmetic number, because the mean of its divisors is an integer number (1210608).

Almost surely, 2^11651871 is an apocalyptic number.

11651871 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11651871 is a deficient number, since it is larger than the sum of its proper divisors (7717857).

11651871 is a wasteful number, since it uses less digits than its factorization.

11651871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50462.

The product of its digits is 1680, while the sum is 30.

The square root of 11651871 is about 3413.4837043701. The cubic root of 11651871 is about 226.7071527547.

The spelling of 11651871 in words is "eleven million, six hundred fifty-one thousand, eight hundred seventy-one".