25323721 has 2 divisors, whose sum is σ = 25323722. Its totient is φ = 25323720.

The previous prime is 25323709. The next prime is 25323731. The reversal of 25323721 is 12732352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13838400 + 11485321 = 3720^2 + 3389^2 .

It is a cyclic number.

It is not a de Polignac number, because 25323721 - 2¹⁵ = 25290953 is a prime.

It is not a weakly prime, because it can be changed into another prime (25323731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12661860 + 12661861.

It is an arithmetic number, because the mean of its divisors is an integer number (12661861).

Almost surely, 2^25323721 is an apocalyptic number.

It is an amenable number.

25323721 is a deficient number, since it is larger than the sum of its proper divisors (1).

25323721 is an equidigital number, since it uses as much as digits as its factorization.

25323721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 25.

The square root of 25323721 is about 5032.2679777611. The cubic root of 25323721 is about 293.6584530780.

The spelling of 25323721 in words is "twenty-five million, three hundred twenty-three thousand, seven hundred twenty-one".