7121506541 has 2 divisors, whose sum is σ = 7121506542. Its totient is φ = 7121506540.

The previous prime is 7121506501. The next prime is 7121506573. The reversal of 7121506541 is 1456051217.

It is an a-pointer prime, because the next prime (7121506573) can be obtained adding 7121506541 to its sum of digits (32).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7086104041 + 35402500 = 84179^2 + 5950^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7121506541 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7121506498 and 7121506507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7121506501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3560753270 + 3560753271.

It is an arithmetic number, because the mean of its divisors is an integer number (3560753271).

Almost surely, 2^7121506541 is an apocalyptic number.

It is an amenable number.

7121506541 is a deficient number, since it is larger than the sum of its proper divisors (1).

7121506541 is an equidigital number, since it uses as much as digits as its factorization.

7121506541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 32.

The square root of 7121506541 is about 84389.0190783137. The cubic root of 7121506541 is about 1923.9360211039.

Adding to 7121506541 its reverse (1456051217), we get a palindrome (8577557758).

The spelling of 7121506541 in words is "seven billion, one hundred twenty-one million, five hundred six thousand, five hundred forty-one".