11550397 has 4 divisors (see below), whose sum is σ = 11832156. Its totient is φ = 11268640.

The previous prime is 11550379. The next prime is 11550419. The reversal of 11550397 is 79305511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5503716 + 6046681 = 2346^2 + 2459^2 .

It is a cyclic number.

It is not a de Polignac number, because 11550397 - 2¹¹ = 11548349 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11550337) 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, 140818 + ... + 140899.

It is an arithmetic number, because the mean of its divisors is an integer number (2958039).

Almost surely, 2^11550397 is an apocalyptic number.

It is an amenable number.

11550397 is a deficient number, since it is larger than the sum of its proper divisors (281759).

11550397 is an equidigital number, since it uses as much as digits as its factorization.

11550397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281758.

The product of its (nonzero) digits is 4725, while the sum is 31.

The square root of 11550397 is about 3398.5875007126. The cubic root of 11550397 is about 226.0471160283.

It can be divided in two parts, 115503 and 97, that added together give a square (115600 = 340²).

The spelling of 11550397 in words is "eleven million, five hundred fifty thousand, three hundred ninety-seven".