1201355521 has 2 divisors, whose sum is σ = 1201355522. Its totient is φ = 1201355520.

The previous prime is 1201355501. The next prime is 1201355549. The reversal of 1201355521 is 1255531021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1199652496 + 1703025 = 34636^2 + 1305^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201355521 - 2¹¹ = 1201353473 is a prime.

It is not a weakly prime, because it can be changed into another prime (1201355501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600677760 + 600677761.

It is an arithmetic number, because the mean of its divisors is an integer number (600677761).

Almost surely, 2^1201355521 is an apocalyptic number.

It is an amenable number.

1201355521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201355521 is an equidigital number, since it uses as much as digits as its factorization.

1201355521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 1201355521 is about 34660.5758896185. The cubic root of 1201355521 is about 1063.0585452844.

Adding to 1201355521 its reverse (1255531021), we get a palindrome (2456886542).

The spelling of 1201355521 in words is "one billion, two hundred one million, three hundred fifty-five thousand, five hundred twenty-one".