7505739721 has 2 divisors, whose sum is σ = 7505739722. Its totient is φ = 7505739720.

The previous prime is 7505739671. The next prime is 7505739733. The reversal of 7505739721 is 1279375057.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7451142400 + 54597321 = 86320^2 + 7389^2 .

It is a cyclic number.

It is not a de Polignac number, because 7505739721 - 2¹³ = 7505731529 is a prime.

It is a super-3 number, since 3×7505739721³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (7505731721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3752869860 + 3752869861.

It is an arithmetic number, because the mean of its divisors is an integer number (3752869861).

Almost surely, 2^7505739721 is an apocalyptic number.

It is an amenable number.

7505739721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7505739721 is an equidigital number, since it uses as much as digits as its factorization.

7505739721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 463050, while the sum is 46.

The square root of 7505739721 is about 86635.6723353608. The cubic root of 7505739721 is about 1957.9330321026.

The spelling of 7505739721 in words is "seven billion, five hundred five million, seven hundred thirty-nine thousand, seven hundred twenty-one".