11651515 has 4 divisors (see below), whose sum is σ = 13981824. Its totient is φ = 9321208.

The previous prime is 11651509. The next prime is 11651537. The reversal of 11651515 is 51515611.

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

It is a cyclic number.

It is not a de Polignac number, because 11651515 - 2⁵ = 11651483 is a prime.

It is a Duffinian number.

11651515 is a modest number, since divided by 1515 gives 1165 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 11651515.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1165147 + ... + 1165156.

It is an arithmetic number, because the mean of its divisors is an integer number (3495456).

Almost surely, 2^11651515 is an apocalyptic number.

11651515 is a deficient number, since it is larger than the sum of its proper divisors (2330309).

11651515 is an equidigital number, since it uses as much as digits as its factorization.

11651515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2330308.

The product of its digits is 750, while the sum is 25.

The square root of 11651515 is about 3413.4315578315. The cubic root of 11651515 is about 226.7048438675.

The spelling of 11651515 in words is "eleven million, six hundred fifty-one thousand, five hundred fifteen".