1201577813 has 2 divisors, whose sum is σ = 1201577814. Its totient is φ = 1201577812.

The previous prime is 1201577807. The next prime is 1201577843. The reversal of 1201577813 is 3187751021.

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., 1192804369 + 8773444 = 34537^2 + 2962^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201577813 - 2⁶ = 1201577749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201577843) 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, 600788906 + 600788907.

It is an arithmetic number, because the mean of its divisors is an integer number (600788907).

Almost surely, 2^1201577813 is an apocalyptic number.

It is an amenable number.

1201577813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201577813 is an equidigital number, since it uses as much as digits as its factorization.

1201577813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11760, while the sum is 35.

The square root of 1201577813 is about 34663.7824393126. The cubic root of 1201577813 is about 1063.1241086785.

The spelling of 1201577813 in words is "one billion, two hundred one million, five hundred seventy-seven thousand, eight hundred thirteen".