11991512 has 16 divisors (see below), whose sum is σ = 24213840. Its totient is φ = 5534496.

The previous prime is 11991481. The next prime is 11991517. The reversal of 11991512 is 21519911.

It is a super-2 number, since 2×11991512² = 287592720092288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11991517) 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, 57548 + ... + 57755.

It is an arithmetic number, because the mean of its divisors is an integer number (1513365).

Almost surely, 2^11991512 is an apocalyptic number.

It is an amenable number.

11991512 is an abundant number, since it is smaller than the sum of its proper divisors (12222328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11991512 is a wasteful number, since it uses less digits than its factorization.

11991512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115322 (or 115318 counting only the distinct ones).

The product of its digits is 810, while the sum is 29.

The square root of 11991512 is about 3462.8762611448. The cubic root of 11991512 is about 228.8888561424. Note that the first 4 decimals are identical.

The spelling of 11991512 in words is "eleven million, nine hundred ninety-one thousand, five hundred twelve".