7216531 has 4 divisors (see below), whose sum is σ = 8247472. Its totient is φ = 6185592.

The previous prime is 7216513. The next prime is 7216537. The reversal of 7216531 is 1356127.

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

It is not a de Polignac number, because 7216531 - 2⁷ = 7216403 is a prime.

It is a super-2 number, since 2×7216531² = 104156639347922, which contains 22 as substring.

It is a Duffinian number.

7216531 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 7216496 and 7216505.

It is not an unprimeable number, because it can be changed into a prime (7216537) 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, 515460 + ... + 515473.

It is an arithmetic number, because the mean of its divisors is an integer number (2061868).

Almost surely, 2^7216531 is an apocalyptic number.

7216531 is a deficient number, since it is larger than the sum of its proper divisors (1030941).

7216531 is a wasteful number, since it uses less digits than its factorization.

7216531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1030940.

The product of its digits is 1260, while the sum is 25.

The square root of 7216531 is about 2686.3601768936. The cubic root of 7216531 is about 193.2455464176.

The spelling of 7216531 in words is "seven million, two hundred sixteen thousand, five hundred thirty-one".