2001113731 has 2 divisors, whose sum is σ = 2001113732. Its totient is φ = 2001113730.

The previous prime is 2001113729. The next prime is 2001113749. The reversal of 2001113731 is 1373111002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2001113731 - 2¹ = 2001113729 is a prime.

It is a super-2 number, since 2×2001113731² = 8008912328793480722, which contains 22 as substring.

Together with 2001113729, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2001113699 and 2001113708.

It is not a weakly prime, because it can be changed into another prime (2001113701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000556865 + 1000556866.

It is an arithmetic number, because the mean of its divisors is an integer number (1000556866).

Almost surely, 2^2001113731 is an apocalyptic number.

2001113731 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001113731 is an equidigital number, since it uses as much as digits as its factorization.

2001113731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126, while the sum is 19.

The square root of 2001113731 is about 44733.8097080944. The cubic root of 2001113731 is about 1260.1548753523.

Adding to 2001113731 its reverse (1373111002), we get a palindrome (3374224733).

The spelling of 2001113731 in words is "two billion, one million, one hundred thirteen thousand, seven hundred thirty-one".