3681615481 has 2 divisors, whose sum is σ = 3681615482. Its totient is φ = 3681615480.

The previous prime is 3681615463. The next prime is 3681615499. The reversal of 3681615481 is 1845161863.

It is a balanced prime because it is at equal distance from previous prime (3681615463) and next prime (3681615499).

It can be written as a sum of positive squares in only one way, i.e., 3350557456 + 331058025 = 57884^2 + 18195^2 .

It is a cyclic number.

It is not a de Polignac number, because 3681615481 - 2⁵ = 3681615449 is a prime.

It is a super-2 number, since 2×3681615481² = 27108585099877722722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3681615781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1840807740 + 1840807741.

It is an arithmetic number, because the mean of its divisors is an integer number (1840807741).

Almost surely, 2^3681615481 is an apocalyptic number.

It is an amenable number.

3681615481 is a deficient number, since it is larger than the sum of its proper divisors (1).

3681615481 is an equidigital number, since it uses as much as digits as its factorization.

3681615481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 43.

The square root of 3681615481 is about 60676.3172992561. The cubic root of 3681615481 is about 1544.1144097223.

The spelling of 3681615481 in words is "three billion, six hundred eighty-one million, six hundred fifteen thousand, four hundred eighty-one".