3117040721 has 2 divisors, whose sum is σ = 3117040722. Its totient is φ = 3117040720.

The previous prime is 3117040697. The next prime is 3117040781. The reversal of 3117040721 is 1270407113.

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., 3073150096 + 43890625 = 55436^2 + 6625^2 .

It is a cyclic number.

It is not a de Polignac number, because 3117040721 - 2⁶ = 3117040657 is a prime.

It is not a weakly prime, because it can be changed into another prime (3117040781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1558520360 + 1558520361.

It is an arithmetic number, because the mean of its divisors is an integer number (1558520361).

Almost surely, 2^3117040721 is an apocalyptic number.

It is an amenable number.

3117040721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3117040721 is an equidigital number, since it uses as much as digits as its factorization.

3117040721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 3117040721 is about 55830.4640944350. The cubic root of 3117040721 is about 1460.7665832619.

Adding to 3117040721 its reverse (1270407113), we get a palindrome (4387447834).

The spelling of 3117040721 in words is "three billion, one hundred seventeen million, forty thousand, seven hundred twenty-one".