775272221 has 2 divisors, whose sum is σ = 775272222. Its totient is φ = 775272220.

The previous prime is 775272187. The next prime is 775272227. The reversal of 775272221 is 122272577.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 707028100 + 68244121 = 26590^2 + 8261^2 .

It is a cyclic number.

It is not a de Polignac number, because 775272221 - 2¹⁰ = 775271197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (775272227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387636110 + 387636111.

It is an arithmetic number, because the mean of its divisors is an integer number (387636111).

Almost surely, 2^775272221 is an apocalyptic number.

It is an amenable number.

775272221 is a deficient number, since it is larger than the sum of its proper divisors (1).

775272221 is an equidigital number, since it uses as much as digits as its factorization.

775272221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27440, while the sum is 35.

The square root of 775272221 is about 27843.7106183784. The cubic root of 775272221 is about 918.6528096490.

The spelling of 775272221 in words is "seven hundred seventy-five million, two hundred seventy-two thousand, two hundred twenty-one".