7561649 has 4 divisors (see below), whose sum is σ = 7577664. Its totient is φ = 7545636.

The previous prime is 7561633. The next prime is 7561681. The reversal of 7561649 is 9461657.

7561649 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7561649 - 2⁴ = 7561633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7561699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7277 + ... + 8250.

It is an arithmetic number, because the mean of its divisors is an integer number (1894416).

Almost surely, 2^7561649 is an apocalyptic number.

It is an amenable number.

7561649 is a deficient number, since it is larger than the sum of its proper divisors (16015).

7561649 is a wasteful number, since it uses less digits than its factorization.

7561649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16014.

The product of its digits is 45360, while the sum is 38.

The square root of 7561649 is about 2749.8452683742. The cubic root of 7561649 is about 196.2782473844.

The spelling of 7561649 in words is "seven million, five hundred sixty-one thousand, six hundred forty-nine".