18970361 has 2 divisors, whose sum is σ = 18970362. Its totient is φ = 18970360.

The previous prime is 18970319. The next prime is 18970411. The reversal of 18970361 is 16307981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12645136 + 6325225 = 3556^2 + 2515^2 .

It is a cyclic number.

It is not a de Polignac number, because 18970361 - 2⁶ = 18970297 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 (18970961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9485180 + 9485181.

It is an arithmetic number, because the mean of its divisors is an integer number (9485181).

Almost surely, 2^18970361 is an apocalyptic number.

It is an amenable number.

18970361 is a deficient number, since it is larger than the sum of its proper divisors (1).

18970361 is an equidigital number, since it uses as much as digits as its factorization.

18970361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 18970361 is about 4355.4977901498. The cubic root of 18970361 is about 266.7013404566.

The spelling of 18970361 in words is "eighteen million, nine hundred seventy thousand, three hundred sixty-one".