911139731 has 2 divisors, whose sum is σ = 911139732. Its totient is φ = 911139730.

The previous prime is 911139727. The next prime is 911139739. The reversal of 911139731 is 137931119.

It is a weak prime.

It is an emirp because it is prime and its reverse (137931119) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 911139731 - 2² = 911139727 is a prime.

It is a super-2 number, since 2×911139731² = 1660351218813504722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 911139691 and 911139700.

It is not a weakly prime, because it can be changed into another prime (911139739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 455569865 + 455569866.

It is an arithmetic number, because the mean of its divisors is an integer number (455569866).

Almost surely, 2^911139731 is an apocalyptic number.

911139731 is a deficient number, since it is larger than the sum of its proper divisors (1).

911139731 is an equidigital number, since it uses as much as digits as its factorization.

911139731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5103, while the sum is 35.

The square root of 911139731 is about 30185.0912041027. The cubic root of 911139731 is about 969.4565031988.

The spelling of 911139731 in words is "nine hundred eleven million, one hundred thirty-nine thousand, seven hundred thirty-one".