1205611501 has 2 divisors, whose sum is σ = 1205611502. Its totient is φ = 1205611500.

The previous prime is 1205611499. The next prime is 1205611529. The reversal of 1205611501 is 1051165021.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1125938025 + 79673476 = 33555^2 + 8926^2 .

It is a cyclic number.

It is not a de Polignac number, because 1205611501 - 2¹ = 1205611499 is a prime.

Together with 1205611499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1205611591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602805750 + 602805751.

It is an arithmetic number, because the mean of its divisors is an integer number (602805751).

Almost surely, 2^1205611501 is an apocalyptic number.

It is an amenable number.

1205611501 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205611501 is an equidigital number, since it uses as much as digits as its factorization.

1205611501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 1205611501 is about 34721.9167241672. The cubic root of 1205611501 is about 1064.3124132652.

Adding to 1205611501 its reverse (1051165021), we get a palindrome (2256776522).

The spelling of 1205611501 in words is "one billion, two hundred five million, six hundred eleven thousand, five hundred one".