11720531 has 8 divisors (see below), whose sum is σ = 12674880. Its totient is φ = 10795648.

The previous prime is 11720509. The next prime is 11720537. The reversal of 11720531 is 13502711.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11720531 is a prime.

It is a super-2 number, since 2×11720531² = 274741693843922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11720537) 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, 6536 + ... + 8133.

It is an arithmetic number, because the mean of its divisors is an integer number (1584360).

Almost surely, 2^11720531 is an apocalyptic number.

11720531 is a deficient number, since it is larger than the sum of its proper divisors (954349).

11720531 is a wasteful number, since it uses less digits than its factorization.

11720531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14733.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 11720531 is about 3423.5261062244. The cubic root of 11720531 is about 227.1515803363.

The spelling of 11720531 in words is "eleven million, seven hundred twenty thousand, five hundred thirty-one".