7251605 has 8 divisors (see below), whose sum is σ = 9213912. Its totient is φ = 5459968.

The previous prime is 7251599. The next prime is 7251617. The reversal of 7251605 is 5061527.

It can be written as a sum of positive squares in 4 ways, for example, as 4008004 + 3243601 = 2002^2 + 1801^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7251605 - 2¹⁸ = 6989461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42572 + ... + 42741.

It is an arithmetic number, because the mean of its divisors is an integer number (1151739).

Almost surely, 2^7251605 is an apocalyptic number.

It is an amenable number.

7251605 is a deficient number, since it is larger than the sum of its proper divisors (1962307).

7251605 is a wasteful number, since it uses less digits than its factorization.

7251605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85335.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 7251605 is about 2692.8804280918. The cubic root of 7251605 is about 193.5581131776.

The spelling of 7251605 in words is "seven million, two hundred fifty-one thousand, six hundred five".