1201151521 has 2 divisors, whose sum is σ = 1201151522. Its totient is φ = 1201151520.

The previous prime is 1201151509. The next prime is 1201151531. The reversal of 1201151521 is 1251511021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1039353121 + 161798400 = 32239^2 + 12720^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201151521 - 2¹⁷ = 1201020449 is a prime.

It is a super-2 number, since 2×1201151521² = 2885529952801226882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1201151531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600575760 + 600575761.

It is an arithmetic number, because the mean of its divisors is an integer number (600575761).

Almost surely, 2^1201151521 is an apocalyptic number.

It is an amenable number.

1201151521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201151521 is an equidigital number, since it uses as much as digits as its factorization.

1201151521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100, while the sum is 19.

The square root of 1201151521 is about 34657.6329399456. The cubic root of 1201151521 is about 1062.9983698643.

Adding to 1201151521 its reverse (1251511021), we get a palindrome (2452662542).

The spelling of 1201151521 in words is "one billion, two hundred one million, one hundred fifty-one thousand, five hundred twenty-one".