11651965 has 8 divisors (see below), whose sum is σ = 15058008. Its totient is φ = 8604480.

The previous prime is 11651963. The next prime is 11651977. The reversal of 11651965 is 56915611.

It can be written as a sum of positive squares in 4 ways, for example, as 241081 + 11410884 = 491^2 + 3378^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11651965 - 2¹ = 11651963 is a prime.

It is a super-2 number, since 2×11651965² = 271536576722450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11651965.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11651963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89566 + ... + 89695.

It is an arithmetic number, because the mean of its divisors is an integer number (1882251).

Almost surely, 2^11651965 is an apocalyptic number.

It is an amenable number.

11651965 is a deficient number, since it is larger than the sum of its proper divisors (3406043).

11651965 is a wasteful number, since it uses less digits than its factorization.

11651965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179279.

The product of its digits is 8100, while the sum is 34.

The square root of 11651965 is about 3413.4974732670. The cubic root of 11651965 is about 226.7077623968.

The spelling of 11651965 in words is "eleven million, six hundred fifty-one thousand, nine hundred sixty-five".