725955821 has 2 divisors, whose sum is σ = 725955822. Its totient is φ = 725955820.

The previous prime is 725955817. The next prime is 725955827. The reversal of 725955821 is 128559527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 574321225 + 151634596 = 23965^2 + 12314^2 .

It is an emirp because it is prime and its reverse (128559527) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 725955821 - 2² = 725955817 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (725955827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362977910 + 362977911.

It is an arithmetic number, because the mean of its divisors is an integer number (362977911).

Almost surely, 2^725955821 is an apocalyptic number.

It is an amenable number.

725955821 is a deficient number, since it is larger than the sum of its proper divisors (1).

725955821 is an equidigital number, since it uses as much as digits as its factorization.

725955821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 252000, while the sum is 44.

The square root of 725955821 is about 26943.5673399051. The cubic root of 725955821 is about 898.7455036293.

The spelling of 725955821 in words is "seven hundred twenty-five million, nine hundred fifty-five thousand, eight hundred twenty-one".