375505561 has 4 divisors (see below), whose sum is σ = 375907252. Its totient is φ = 375103872.

The previous prime is 375505553. The next prime is 375505579. The reversal of 375505561 is 165505573.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 226201600 + 149303961 = 15040^2 + 12219^2 .

It is a cyclic number.

It is not a de Polignac number, because 375505561 - 2³ = 375505553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 375505561.

It is not an unprimeable number, because it can be changed into a prime (375505591) 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 in 3 ways as a sum of consecutive naturals, for example, 199440 + ... + 201313.

It is an arithmetic number, because the mean of its divisors is an integer number (93976813).

Almost surely, 2^375505561 is an apocalyptic number.

It is an amenable number.

375505561 is a deficient number, since it is larger than the sum of its proper divisors (401691).

375505561 is an equidigital number, since it uses as much as digits as its factorization.

375505561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401690.

The product of its (nonzero) digits is 78750, while the sum is 37.

The square root of 375505561 is about 19377.9658633201. The cubic root of 375505561 is about 721.4487041366.

The spelling of 375505561 in words is "three hundred seventy-five million, five hundred five thousand, five hundred sixty-one".