11951515 has 12 divisors (see below), whose sum is σ = 14563584. Its totient is φ = 9415536.

The previous prime is 11951507. The next prime is 11951519. The reversal of 11951515 is 51515911.

It is not a de Polignac number, because 11951515 - 2³ = 11951507 is a prime.

It is a Duffinian number.

11951515 is a modest number, since divided by 1515 gives 1195 as remainder.

It is not an unprimeable number, because it can be changed into a prime (11951519) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31014 + ... + 31396.

It is an arithmetic number, because the mean of its divisors is an integer number (1213632).

Almost surely, 2^11951515 is an apocalyptic number.

11951515 is a deficient number, since it is larger than the sum of its proper divisors (2612069).

11951515 is an frugal number, since it uses more digits than its factorization.

11951515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546 (or 467 counting only the distinct ones).

The product of its digits is 1125, while the sum is 28.

The square root of 11951515 is about 3457.0963249525. The cubic root of 11951515 is about 228.6340907997.

The spelling of 11951515 in words is "eleven million, nine hundred fifty-one thousand, five hundred fifteen".