725283521 has 2 divisors, whose sum is σ = 725283522. Its totient is φ = 725283520.

The previous prime is 725283511. The next prime is 725283551. The reversal of 725283521 is 125382527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 724201921 + 1081600 = 26911^2 + 1040^2 .

It is a cyclic number.

It is not a de Polignac number, because 725283521 - 2²² = 721089217 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (725283511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362641760 + 362641761.

It is an arithmetic number, because the mean of its divisors is an integer number (362641761).

Almost surely, 2^725283521 is an apocalyptic number.

It is an amenable number.

725283521 is a deficient number, since it is larger than the sum of its proper divisors (1).

725283521 is an equidigital number, since it uses as much as digits as its factorization.

725283521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33600, while the sum is 35.

The square root of 725283521 is about 26931.0883738478. The cubic root of 725283521 is about 898.4679783753.

The spelling of 725283521 in words is "seven hundred twenty-five million, two hundred eighty-three thousand, five hundred twenty-one".