7216529891 has 8 divisors (see below), whose sum is σ = 7358748384. Its totient is φ = 7075699200.

The previous prime is 7216529861. The next prime is 7216529921. The reversal of 7216529891 is 1989256127.

It is an interprime number because it is at equal distance from previous prime (7216529861) and next prime (7216529921).

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

It is a cyclic number.

It is not a de Polignac number, because 7216529891 - 2²² = 7212335587 is a prime.

It is a super-3 number, since 3×7216529891³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7216529861) 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, 336446 + ... + 357251.

It is an arithmetic number, because the mean of its divisors is an integer number (919843548).

Almost surely, 2^7216529891 is an apocalyptic number.

7216529891 is a deficient number, since it is larger than the sum of its proper divisors (142218493).

7216529891 is a wasteful number, since it uses less digits than its factorization.

7216529891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693901.

The product of its digits is 544320, while the sum is 50.

The square root of 7216529891 is about 84950.1612182108. The cubic root of 7216529891 is about 1932.4553651856.

The spelling of 7216529891 in words is "seven billion, two hundred sixteen million, five hundred twenty-nine thousand, eight hundred ninety-one".