7271521361 has 8 divisors (see below), whose sum is σ = 7908403944. Its totient is φ = 6645715200.

The previous prime is 7271521357. The next prime is 7271521363. The reversal of 7271521361 is 1631251727.

It can be written as a sum of positive squares in 4 ways, for example, as 618019600 + 6653501761 = 24860^2 + 81569^2 .

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 7271521361 - 2² = 7271521357 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7271521363) 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, 2767736 + ... + 2770361.

It is an arithmetic number, because the mean of its divisors is an integer number (988550493).

Almost surely, 2^7271521361 is an apocalyptic number.

It is an amenable number.

7271521361 is a deficient number, since it is larger than the sum of its proper divisors (636882583).

7271521361 is a wasteful number, since it uses less digits than its factorization.

7271521361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5538211.

The product of its digits is 17640, while the sum is 35.

The square root of 7271521361 is about 85273.2159649207. The cubic root of 7271521361 is about 1937.3515211975.

The spelling of 7271521361 in words is "seven billion, two hundred seventy-one million, five hundred twenty-one thousand, three hundred sixty-one".