1725438821 has 2 divisors, whose sum is σ = 1725438822. Its totient is φ = 1725438820.

The previous prime is 1725438727. The next prime is 1725438833. The reversal of 1725438821 is 1288345271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1031116321 + 694322500 = 32111^2 + 26350^2 .

It is a cyclic number.

It is not a de Polignac number, because 1725438821 - 2¹⁴ = 1725422437 is a prime.

It is a congruent number.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 862719410 + 862719411.

It is an arithmetic number, because the mean of its divisors is an integer number (862719411).

Almost surely, 2^1725438821 is an apocalyptic number.

It is an amenable number.

1725438821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1725438821 is an equidigital number, since it uses as much as digits as its factorization.

1725438821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107520, while the sum is 41.

The square root of 1725438821 is about 41538.4017627063. The cubic root of 1725438821 is about 1199.4068413414.

The spelling of 1725438821 in words is "one billion, seven hundred twenty-five million, four hundred thirty-eight thousand, eight hundred twenty-one".