1606981237 has 2 divisors, whose sum is σ = 1606981238. Its totient is φ = 1606981236.

The previous prime is 1606981217. The next prime is 1606981247. The reversal of 1606981237 is 7321896061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1578155076 + 28826161 = 39726^2 + 5369^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1606981237 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1606981193 and 1606981202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1606981217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 803490618 + 803490619.

It is an arithmetic number, because the mean of its divisors is an integer number (803490619).

Almost surely, 2^1606981237 is an apocalyptic number.

It is an amenable number.

1606981237 is a deficient number, since it is larger than the sum of its proper divisors (1).

1606981237 is an equidigital number, since it uses as much as digits as its factorization.

1606981237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 1606981237 is about 40087.1704788452. The cubic root of 1606981237 is about 1171.3057322050.

The spelling of 1606981237 in words is "one billion, six hundred six million, nine hundred eighty-one thousand, two hundred thirty-seven".