3731609672309 has 2 divisors, whose sum is σ = 3731609672310. Its totient is φ = 3731609672308.

The previous prime is 3731609672291. The next prime is 3731609672363. The reversal of 3731609672309 is 9032769061373.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2213593474225 + 1518016198084 = 1487815^2 + 1232078^2 .

It is a cyclic number.

It is not a de Polignac number, because 3731609672309 - 2⁸ = 3731609672053 is a prime.

It is a super-2 number, since 2×3731609672309² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3731609672509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1865804836154 + 1865804836155.

It is an arithmetic number, because the mean of its divisors is an integer number (1865804836155).

Almost surely, 2^{3731609672309} is an apocalyptic number.

It is an amenable number.

3731609672309 is a deficient number, since it is larger than the sum of its proper divisors (1).

3731609672309 is an equidigital number, since it uses as much as digits as its factorization.

3731609672309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7715736, while the sum is 56.

The spelling of 3731609672309 in words is "three trillion, seven hundred thirty-one billion, six hundred nine million, six hundred seventy-two thousand, three hundred nine".