75772561 has 2 divisors, whose sum is σ = 75772562. Its totient is φ = 75772560.

The previous prime is 75772547. The next prime is 75772577. The reversal of 75772561 is 16527757.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66585600 + 9186961 = 8160^2 + 3031^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75772561 is a prime.

It is not a weakly prime, because it can be changed into another prime (75772591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37886280 + 37886281.

It is an arithmetic number, because the mean of its divisors is an integer number (37886281).

Almost surely, 2^75772561 is an apocalyptic number.

It is an amenable number.

75772561 is a deficient number, since it is larger than the sum of its proper divisors (1).

75772561 is an equidigital number, since it uses as much as digits as its factorization.

75772561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 102900, while the sum is 40.

The square root of 75772561 is about 8704.7435918584. The cubic root of 75772561 is about 423.1593961000.

The spelling of 75772561 in words is "seventy-five million, seven hundred seventy-two thousand, five hundred sixty-one".