1311919193 has 4 divisors (see below), whose sum is σ = 1412836068. Its totient is φ = 1211002320.

The previous prime is 1311919183. The next prime is 1311919211. The reversal of 1311919193 is 3919191131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 567011344 + 744907849 = 23812^2 + 27293^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311919193 - 2⁴ = 1311919177 is a prime.

It is a super-2 number, since 2×1311919193² = 3442263937923542498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311919153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50458418 + ... + 50458443.

It is an arithmetic number, because the mean of its divisors is an integer number (353209017).

Almost surely, 2^1311919193 is an apocalyptic number.

1311919193 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1311919193 is a deficient number, since it is larger than the sum of its proper divisors (100916875).

1311919193 is a wasteful number, since it uses less digits than its factorization.

1311919193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100916874.

The product of its digits is 6561, while the sum is 38.

The square root of 1311919193 is about 36220.4250803328. The cubic root of 1311919193 is about 1094.7182592151.

The spelling of 1311919193 in words is "one billion, three hundred eleven million, nine hundred nineteen thousand, one hundred ninety-three".