7561009 has 2 divisors, whose sum is σ = 7561010. Its totient is φ = 7561008.

The previous prime is 7561007. The next prime is 7561013. The reversal of 7561009 is 9001657.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7441984 + 119025 = 2728^2 + 345^2 .

It is a cyclic number.

It is not a de Polignac number, because 7561009 - 2¹ = 7561007 is a prime.

Together with 7561007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (7561007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3780504 + 3780505.

It is an arithmetic number, because the mean of its divisors is an integer number (3780505).

Almost surely, 2^7561009 is an apocalyptic number.

It is an amenable number.

7561009 is a deficient number, since it is larger than the sum of its proper divisors (1).

7561009 is an equidigital number, since it uses as much as digits as its factorization.

7561009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 7561009 is about 2749.7288957277. The cubic root of 7561009 is about 196.2727097200.

The spelling of 7561009 in words is "seven million, five hundred sixty-one thousand, nine".