7216745281 has 4 divisors (see below), whose sum is σ = 7596574000. Its totient is φ = 6836916564.

The previous prime is 7216745279. The next prime is 7216745299. The reversal of 7216745281 is 1825476127.

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.

It is a cyclic number.

It is not a de Polignac number, because 7216745281 - 2¹ = 7216745279 is a prime.

It is a super-2 number, since 2×7216745281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7216745201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189914331 + ... + 189914368.

It is an arithmetic number, because the mean of its divisors is an integer number (1899143500).

Almost surely, 2^7216745281 is an apocalyptic number.

It is an amenable number.

7216745281 is a deficient number, since it is larger than the sum of its proper divisors (379828719).

7216745281 is a wasteful number, since it uses less digits than its factorization.

7216745281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379828718.

The product of its digits is 188160, while the sum is 43.

The square root of 7216745281 is about 84951.4289520783. The cubic root of 7216745281 is about 1932.4745908350.

The spelling of 7216745281 in words is "seven billion, two hundred sixteen million, seven hundred forty-five thousand, two hundred eighty-one".