755561971 has 2 divisors, whose sum is σ = 755561972. Its totient is φ = 755561970.

The previous prime is 755561953. The next prime is 755561993. The reversal of 755561971 is 179165557.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 755561971 - 2²¹ = 753464819 is a prime.

It is not a weakly prime, because it can be changed into another prime (755561071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 377780985 + 377780986.

It is an arithmetic number, because the mean of its divisors is an integer number (377780986).

Almost surely, 2^755561971 is an apocalyptic number.

755561971 is a deficient number, since it is larger than the sum of its proper divisors (1).

755561971 is an equidigital number, since it uses as much as digits as its factorization.

755561971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 330750, while the sum is 46.

The square root of 755561971 is about 27487.4875352405. The cubic root of 755561971 is about 910.8007165621.

The spelling of 755561971 in words is "seven hundred fifty-five million, five hundred sixty-one thousand, nine hundred seventy-one".