7613031721 has 2 divisors, whose sum is σ = 7613031722. Its totient is φ = 7613031720.

The previous prime is 7613031697. The next prime is 7613031731. The reversal of 7613031721 is 1271303167.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6994813225 + 618218496 = 83635^2 + 24864^2 .

It is a cyclic number.

It is not a de Polignac number, because 7613031721 - 2⁵ = 7613031689 is a prime.

It is not a weakly prime, because it can be changed into another prime (7613031731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3806515860 + 3806515861.

It is an arithmetic number, because the mean of its divisors is an integer number (3806515861).

Almost surely, 2^7613031721 is an apocalyptic number.

It is an amenable number.

7613031721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7613031721 is an equidigital number, since it uses as much as digits as its factorization.

7613031721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 7613031721 is about 87252.6889041249. The cubic root of 7613031721 is about 1967.2182578282.

Adding to 7613031721 its reverse (1271303167), we get a palindrome (8884334888).

The spelling of 7613031721 in words is "seven billion, six hundred thirteen million, thirty-one thousand, seven hundred twenty-one".