911491613 has 2 divisors, whose sum is σ = 911491614. Its totient is φ = 911491612.

The previous prime is 911491583. The next prime is 911491621. The reversal of 911491613 is 316194119.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 888814969 + 22676644 = 29813^2 + 4762^2 .

It is a cyclic number.

It is not a de Polignac number, because 911491613 - 2¹² = 911487517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (911491013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 455745806 + 455745807.

It is an arithmetic number, because the mean of its divisors is an integer number (455745807).

Almost surely, 2^911491613 is an apocalyptic number.

It is an amenable number.

911491613 is a deficient number, since it is larger than the sum of its proper divisors (1).

911491613 is an equidigital number, since it uses as much as digits as its factorization.

911491613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 35.

The square root of 911491613 is about 30190.9193798400. The cubic root of 911491613 is about 969.5812884451.

The spelling of 911491613 in words is "nine hundred eleven million, four hundred ninety-one thousand, six hundred thirteen".