11951965 has 8 divisors (see below), whose sum is σ = 14361048. Its totient is φ = 9549120.

The previous prime is 11951963. The next prime is 11951983. The reversal of 11951965 is 56915911.

It can be written as a sum of positive squares in 4 ways, for example, as 942841 + 11009124 = 971^2 + 3318^2 .

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

It is not a de Polignac number, because 11951965 - 2¹ = 11951963 is a prime.

It is a super-2 number, since 2×11951965² = 285698934722450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11951963) 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, 5995 + ... + 7735.

It is an arithmetic number, because the mean of its divisors is an integer number (1795131).

Almost surely, 2^11951965 is an apocalyptic number.

It is an amenable number.

11951965 is a deficient number, since it is larger than the sum of its proper divisors (2409083).

11951965 is a wasteful number, since it uses less digits than its factorization.

11951965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3119.

The product of its digits is 12150, while the sum is 37.

The square root of 11951965 is about 3457.1614078605. The cubic root of 11951965 is about 228.6369602838.

It can be divided in two parts, 1195 and 1965, that added together give a triangular number (3160 = T₇₉).

The spelling of 11951965 in words is "eleven million, nine hundred fifty-one thousand, nine hundred sixty-five".