7211128157 has 2 divisors, whose sum is σ = 7211128158. Its totient is φ = 7211128156.

The previous prime is 7211128129. The next prime is 7211128163. The reversal of 7211128157 is 7518211127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5863577476 + 1347550681 = 76574^2 + 36709^2 .

It is a cyclic number.

It is not a de Polignac number, because 7211128157 - 2¹² = 7211124061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7211188157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3605564078 + 3605564079.

It is an arithmetic number, because the mean of its divisors is an integer number (3605564079).

Almost surely, 2^7211128157 is an apocalyptic number.

It is an amenable number.

7211128157 is a deficient number, since it is larger than the sum of its proper divisors (1).

7211128157 is an equidigital number, since it uses as much as digits as its factorization.

7211128157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7840, while the sum is 35.

The square root of 7211128157 is about 84918.3617187708. The cubic root of 7211128157 is about 1931.9730828144.

The spelling of 7211128157 in words is "seven billion, two hundred eleven million, one hundred twenty-eight thousand, one hundred fifty-seven".