1205015501 has 2 divisors, whose sum is σ = 1205015502. Its totient is φ = 1205015500.

The previous prime is 1205015491. The next prime is 1205015503. The reversal of 1205015501 is 1055105021.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 850597225 + 354418276 = 29165^2 + 18826^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1205015501 is a prime.

Together with 1205015503, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1205015503) 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, 602507750 + 602507751.

It is an arithmetic number, because the mean of its divisors is an integer number (602507751).

Almost surely, 2^1205015501 is an apocalyptic number.

It is an amenable number.

1205015501 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205015501 is an equidigital number, since it uses as much as digits as its factorization.

1205015501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 1205015501 is about 34713.3331876960. Note that the first 3 decimals coincide. The cubic root of 1205015501 is about 1064.1370016575.

The spelling of 1205015501 in words is "one billion, two hundred five million, fifteen thousand, five hundred one".