11961519 has 4 divisors (see below), whose sum is σ = 15948696. Its totient is φ = 7974344.

The previous prime is 11961491. The next prime is 11961527. The reversal of 11961519 is 91516911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91516911 = 3 ⋅30505637.

It is a cyclic number.

It is not a de Polignac number, because 11961519 - 2⁵ = 11961487 is a prime.

It is a super-2 number, since 2×11961519² = 286155873574722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11961519.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11961569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1993584 + ... + 1993589.

It is an arithmetic number, because the mean of its divisors is an integer number (3987174).

Almost surely, 2^11961519 is an apocalyptic number.

11961519 is a deficient number, since it is larger than the sum of its proper divisors (3987177).

11961519 is an equidigital number, since it uses as much as digits as its factorization.

11961519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3987176.

The product of its digits is 2430, while the sum is 33.

The square root of 11961519 is about 3458.5429012808. The cubic root of 11961519 is about 228.6978656310.

The spelling of 11961519 in words is "eleven million, nine hundred sixty-one thousand, five hundred nineteen".