27525721 has 2 divisors, whose sum is σ = 27525722. Its totient is φ = 27525720.

The previous prime is 27525713. The next prime is 27525731. The reversal of 27525721 is 12752572.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27457600 + 68121 = 5240^2 + 261^2 .

It is a cyclic number.

It is not a de Polignac number, because 27525721 - 2³ = 27525713 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27525731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13762860 + 13762861.

It is an arithmetic number, because the mean of its divisors is an integer number (13762861).

Almost surely, 2^27525721 is an apocalyptic number.

It is an amenable number.

27525721 is a deficient number, since it is larger than the sum of its proper divisors (1).

27525721 is an equidigital number, since it uses as much as digits as its factorization.

27525721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9800, while the sum is 31.

The square root of 27525721 is about 5246.4960688063. The cubic root of 27525721 is about 301.9346122488.

The spelling of 27525721 in words is "twenty-seven million, five hundred twenty-five thousand, seven hundred twenty-one".