11541997 has 4 divisors (see below), whose sum is σ = 12220956. Its totient is φ = 10863040.

The previous prime is 11541991. The next prime is 11542001. The reversal of 11541997 is 79914511.

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 10329796 + 1212201 = 3214^2 + 1101^2 .

It is a cyclic number.

It is not a de Polignac number, because 11541997 - 2³ = 11541989 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 (11541991) 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, 339454 + ... + 339487.

It is an arithmetic number, because the mean of its divisors is an integer number (3055239).

Almost surely, 2^11541997 is an apocalyptic number.

11541997 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

11541997 is a deficient number, since it is larger than the sum of its proper divisors (678959).

11541997 is an equidigital number, since it uses as much as digits as its factorization.

11541997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678958.

The product of its digits is 11340, while the sum is 37.

The square root of 11541997 is about 3397.3514684236. The cubic root of 11541997 is about 225.9923053219.

The spelling of 11541997 in words is "eleven million, five hundred forty-one thousand, nine hundred ninety-seven".