1201521617 has 2 divisors, whose sum is σ = 1201521618. Its totient is φ = 1201521616.

The previous prime is 1201521539. The next prime is 1201521623. The reversal of 1201521617 is 7161251021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1109955856 + 91565761 = 33316^2 + 9569^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201521617 - 2⁸ = 1201521361 is a prime.

It is a super-2 number, since 2×1201521617² = 2887308392236589378, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1201521917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600760808 + 600760809.

It is an arithmetic number, because the mean of its divisors is an integer number (600760809).

Almost surely, 2^1201521617 is an apocalyptic number.

It is an amenable number.

1201521617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201521617 is an equidigital number, since it uses as much as digits as its factorization.

1201521617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 26.

The square root of 1201521617 is about 34662.9718431643. The cubic root of 1201521617 is about 1063.1075348445.

Adding to 1201521617 its reverse (7161251021), we get a palindrome (8362772638).

The spelling of 1201521617 in words is "one billion, two hundred one million, five hundred twenty-one thousand, six hundred seventeen".