11981597 has 8 divisors (see below), whose sum is σ = 12557376. Its totient is φ = 11410432.

The previous prime is 11981587. The next prime is 11981603. The reversal of 11981597 is 79518911.

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

It is a cyclic number.

It is not a de Polignac number, because 11981597 - 2⁸ = 11981341 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 (11981587) 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, 4898 + ... + 6924.

It is an arithmetic number, because the mean of its divisors is an integer number (1569672).

Almost surely, 2^11981597 is an apocalyptic number.

It is an amenable number.

11981597 is a deficient number, since it is larger than the sum of its proper divisors (575779).

11981597 is a wasteful number, since it uses less digits than its factorization.

11981597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2307.

The product of its digits is 22680, while the sum is 41.

The square root of 11981597 is about 3461.4443517122. Note that the first 3 decimals coincide. The cubic root of 11981597 is about 228.8257543201.

The spelling of 11981597 in words is "eleven million, nine hundred eighty-one thousand, five hundred ninety-seven".