2925721 has 2 divisors, whose sum is σ = 2925722. Its totient is φ = 2925720.

The previous prime is 2925707. The next prime is 2925731. The reversal of 2925721 is 1275292.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2890000 + 35721 = 1700^2 + 189^2 .

It is a cyclic number.

It is not a de Polignac number, because 2925721 - 2¹³ = 2917529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2925721.

It is not a weakly prime, because it can be changed into another prime (2925731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1462860 + 1462861.

It is an arithmetic number, because the mean of its divisors is an integer number (1462861).

2^2925721 is an apocalyptic number.

It is an amenable number.

2925721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2925721 is an equidigital number, since it uses as much as digits as its factorization.

2925721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 28.

The square root of 2925721 is about 1710.4739109381. The cubic root of 2925721 is about 143.0246750254.

The spelling of 2925721 in words is "two million, nine hundred twenty-five thousand, seven hundred twenty-one".