11521731 has 8 divisors (see below), whose sum is σ = 16544080. Its totient is φ = 7090272.

The previous prime is 11521717. The next prime is 11521747. The reversal of 11521731 is 13712511.

It is a happy number.

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

It is not a de Polignac number, because 11521731 - 2⁷ = 11521603 is a prime.

It is a super-2 number, since 2×11521731² = 265500570472722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11521698 and 11521707.

It is not an unprimeable number, because it can be changed into a prime (11521711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147676 + ... + 147753.

It is an arithmetic number, because the mean of its divisors is an integer number (2068010).

Almost surely, 2^11521731 is an apocalyptic number.

11521731 is a deficient number, since it is larger than the sum of its proper divisors (5022349).

11521731 is a wasteful number, since it uses less digits than its factorization.

11521731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295445.

The product of its digits is 210, while the sum is 21.

The square root of 11521731 is about 3394.3675405000. The cubic root of 11521731 is about 225.8599584022.

The spelling of 11521731 in words is "eleven million, five hundred twenty-one thousand, seven hundred thirty-one".