7561531 has 2 divisors, whose sum is σ = 7561532. Its totient is φ = 7561530.

The previous prime is 7561517. The next prime is 7561537. The reversal of 7561531 is 1351657.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7561531 - 2⁹ = 7561019 is a prime.

It is a super-2 number, since 2×7561531² = 114353502127922, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 7561531.

It is not a weakly prime, because it can be changed into another prime (7561537) by changing a digit.

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 as a sum of consecutive naturals, namely, 3780765 + 3780766.

It is an arithmetic number, because the mean of its divisors is an integer number (3780766).

Almost surely, 2^7561531 is an apocalyptic number.

7561531 is a deficient number, since it is larger than the sum of its proper divisors (1).

7561531 is an equidigital number, since it uses as much as digits as its factorization.

7561531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3150, while the sum is 28.

The square root of 7561531 is about 2749.8238125378. The cubic root of 7561531 is about 196.2772264010.

The spelling of 7561531 in words is "seven million, five hundred sixty-one thousand, five hundred thirty-one".