373309561 has 2 divisors, whose sum is σ = 373309562. Its totient is φ = 373309560.

The previous prime is 373309537. The next prime is 373309589. The reversal of 373309561 is 165903373.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 359292025 + 14017536 = 18955^2 + 3744^2 .

It is a cyclic number.

It is not a de Polignac number, because 373309561 - 2⁵ = 373309529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 373309561.

It is not a weakly prime, because it can be changed into another prime (373309591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 186654780 + 186654781.

It is an arithmetic number, because the mean of its divisors is an integer number (186654781).

Almost surely, 2^373309561 is an apocalyptic number.

It is an amenable number.

373309561 is a deficient number, since it is larger than the sum of its proper divisors (1).

373309561 is an equidigital number, since it uses as much as digits as its factorization.

373309561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51030, while the sum is 37.

The square root of 373309561 is about 19321.2204842241. The cubic root of 373309561 is about 720.0395818003.

The spelling of 373309561 in words is "three hundred seventy-three million, three hundred nine thousand, five hundred sixty-one".