11897511 has 8 divisors (see below), whose sum is σ = 16410480. Its totient is φ = 7658112.

The previous prime is 11897507. The next prime is 11897513. The reversal of 11897511 is 11579811.

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

It is not a de Polignac number, because 11897511 - 2² = 11897507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11897513) 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 7 ways as a sum of consecutive naturals, for example, 68290 + ... + 68463.

It is an arithmetic number, because the mean of its divisors is an integer number (2051310).

Almost surely, 2^11897511 is an apocalyptic number.

11897511 is a deficient number, since it is larger than the sum of its proper divisors (4512969).

11897511 is a wasteful number, since it uses less digits than its factorization.

11897511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136785.

The product of its digits is 2520, while the sum is 33.

The square root of 11897511 is about 3449.2768807389. The cubic root of 11897511 is about 228.2892028779.

The spelling of 11897511 in words is "eleven million, eight hundred ninety-seven thousand, five hundred eleven".