11961597 has 4 divisors (see below), whose sum is σ = 15948800. Its totient is φ = 7974396.

The previous prime is 11961589. The next prime is 11961647. The reversal of 11961597 is 79516911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 11961597 - 2³ = 11961589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11961527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1993597 + ... + 1993602.

It is an arithmetic number, because the mean of its divisors is an integer number (3987200).

Almost surely, 2^11961597 is an apocalyptic number.

It is an amenable number.

11961597 is a deficient number, since it is larger than the sum of its proper divisors (3987203).

11961597 is an equidigital number, since it uses as much as digits as its factorization.

11961597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3987202.

The product of its digits is 17010, while the sum is 39.

The square root of 11961597 is about 3458.5541776875. The cubic root of 11961597 is about 228.6983627360.

It can be divided in two parts, 119 and 61597, that added together give a palindrome (61716).

The spelling of 11961597 in words is "eleven million, nine hundred sixty-one thousand, five hundred ninety-seven".