7272021173 has 2 divisors, whose sum is σ = 7272021174. Its totient is φ = 7272021172.

The previous prime is 7272021157. The next prime is 7272021187. The reversal of 7272021173 is 3711202727.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4136805124 + 3135216049 = 64318^2 + 55993^2 .

It is a cyclic number.

It is not a de Polignac number, because 7272021173 - 2⁴ = 7272021157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7272021073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3636010586 + 3636010587.

It is an arithmetic number, because the mean of its divisors is an integer number (3636010587).

Almost surely, 2^7272021173 is an apocalyptic number.

It is an amenable number.

7272021173 is a deficient number, since it is larger than the sum of its proper divisors (1).

7272021173 is an equidigital number, since it uses as much as digits as its factorization.

7272021173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8232, while the sum is 32.

The square root of 7272021173 is about 85276.1465651445. The cubic root of 7272021173 is about 1937.3959084862.

The spelling of 7272021173 in words is "seven billion, two hundred seventy-two million, twenty-one thousand, one hundred seventy-three".