1203661613 has 16 divisors (see below), whose sum is σ = 1502001024. Its totient is φ = 937085760.

The previous prime is 1203661607. The next prime is 1203661621. The reversal of 1203661613 is 3161663021.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1203661613 - 2⁸ = 1203661357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1203601613) 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 in 15 ways as a sum of consecutive naturals, for example, 88931 + ... + 101567.

It is an arithmetic number, because the mean of its divisors is an integer number (93875064).

Almost surely, 2^1203661613 is an apocalyptic number.

It is an amenable number.

1203661613 is a deficient number, since it is larger than the sum of its proper divisors (298339411).

1203661613 is a wasteful number, since it uses less digits than its factorization.

1203661613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13892.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 1203661613 is about 34693.8267275318. The cubic root of 1203661613 is about 1063.7383173738.

The spelling of 1203661613 in words is "one billion, two hundred three million, six hundred sixty-one thousand, six hundred thirteen".