11931831895738 has 4 divisors (see below), whose sum is σ = 17897747843610. Its totient is φ = 5965915947868.

The previous prime is 11931831895721. The next prime is 11931831895741. The reversal of 11931831895738 is 83759813813911.

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

It can be written as a sum of positive squares in only one way, i.e., 11822133818889 + 109698076849 = 3438333^2 + 331207^2 .

It is a super-2 number, since 2×11931831895738² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2982957973933 + ... + 2982957973936.

Almost surely, 2^{11931831895738} is an apocalyptic number.

11931831895738 is a deficient number, since it is larger than the sum of its proper divisors (5965915947872).

11931831895738 is an equidigital number, since it uses as much as digits as its factorization.

11931831895738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5965915947871.

The product of its digits is 39191040, while the sum is 67.

The spelling of 11931831895738 in words is "eleven trillion, nine hundred thirty-one billion, eight hundred thirty-one million, eight hundred ninety-five thousand, seven hundred thirty-eight".