1522772221 has 2 divisors, whose sum is σ = 1522772222. Its totient is φ = 1522772220.

The previous prime is 1522772197. The next prime is 1522772239. The reversal of 1522772221 is 1222772251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1089924196 + 432848025 = 33014^2 + 20805^2 .

It is a cyclic number.

It is not a de Polignac number, because 1522772221 - 2¹¹ = 1522770173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1522772621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 761386110 + 761386111.

It is an arithmetic number, because the mean of its divisors is an integer number (761386111).

Almost surely, 2^1522772221 is an apocalyptic number.

It is an amenable number.

1522772221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1522772221 is an equidigital number, since it uses as much as digits as its factorization.

1522772221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7840, while the sum is 31.

The square root of 1522772221 is about 39022.7141675204. The cubic root of 1522772221 is about 1150.4779918457.

The spelling of 1522772221 in words is "one billion, five hundred twenty-two million, seven hundred seventy-two thousand, two hundred twenty-one".