1203918313 has 18 divisors (see below), whose sum is σ = 1321968942. Its totient is φ = 1095793920.

The previous prime is 1203918307. The next prime is 1203918329. The reversal of 1203918313 is 3138193021.

It can be written as a sum of positive squares in 3 ways, for example, as 660969 + 1203257344 = 813^2 + 34688^2 .

It is not a de Polignac number, because 1203918313 - 2⁹ = 1203917801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1203918013) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4442368 + ... + 4442638.

It is an arithmetic number, because the mean of its divisors is an integer number (73442719).

Almost surely, 2^1203918313 is an apocalyptic number.

1203918313 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1203918313 is a deficient number, since it is larger than the sum of its proper divisors (118050629).

1203918313 is an frugal number, since it uses more digits than its factorization.

1203918313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665 (or 381 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 1203918313 is about 34697.5260357277. The cubic root of 1203918313 is about 1063.8139317086.

The spelling of 1203918313 in words is "one billion, two hundred three million, nine hundred eighteen thousand, three hundred thirteen".