371561 has 2 divisors, whose sum is σ = 371562. Its totient is φ = 371560.

The previous prime is 371549. The next prime is 371573. The reversal of 371561 is 165173.

It is a balanced prime because it is at equal distance from previous prime (371549) and next prime (371573).

It can be written as a sum of positive squares in only one way, i.e., 295936 + 75625 = 544^2 + 275^2 .

It is an emirp because it is prime and its reverse (165173) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 371561 - 2¹⁰ = 370537 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (370561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 185780 + 185781.

It is an arithmetic number, because the mean of its divisors is an integer number (185781).

2³⁷¹⁵⁶¹ is an apocalyptic number.

It is an amenable number.

371561 is a deficient number, since it is larger than the sum of its proper divisors (1).

371561 is an equidigital number, since it uses as much as digits as its factorization.

371561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 630, while the sum is 23.

The square root of 371561 is about 609.5580366134. The cubic root of 371561 is about 71.8913613666.

The spelling of 371561 in words is "three hundred seventy-one thousand, five hundred sixty-one".