11722513 has 4 divisors (see below), whose sum is σ = 12788208. Its totient is φ = 10656820.

The previous prime is 11722511. The next prime is 11722517. The reversal of 11722513 is 31522711.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31522711 = 11 ⋅2865701.

It is a cyclic number.

It is not a de Polignac number, because 11722513 - 2¹ = 11722511 is a prime.

It is a super-2 number, since 2×11722513² = 274834622070338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11722511) 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, 532831 + ... + 532852.

It is an arithmetic number, because the mean of its divisors is an integer number (3197052).

Almost surely, 2^11722513 is an apocalyptic number.

It is an amenable number.

11722513 is a deficient number, since it is larger than the sum of its proper divisors (1065695).

11722513 is a wasteful number, since it uses less digits than its factorization.

11722513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065694.

The product of its digits is 420, while the sum is 22.

The square root of 11722513 is about 3423.8155616213. The cubic root of 11722513 is about 227.1643837681.

The spelling of 11722513 in words is "eleven million, seven hundred twenty-two thousand, five hundred thirteen".