911640449 has 2 divisors, whose sum is σ = 911640450. Its totient is φ = 911640448.

The previous prime is 911640407. The next prime is 911640451. The reversal of 911640449 is 944046119.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 753886849 + 157753600 = 27457^2 + 12560^2 .

It is an emirp because it is prime and its reverse (944046119) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 911640449 - 2²⁸ = 643204993 is a prime.

Together with 911640451, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (911640479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 455820224 + 455820225.

It is an arithmetic number, because the mean of its divisors is an integer number (455820225).

Almost surely, 2^911640449 is an apocalyptic number.

It is an amenable number.

911640449 is a deficient number, since it is larger than the sum of its proper divisors (1).

911640449 is an equidigital number, since it uses as much as digits as its factorization.

911640449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 911640449 is about 30193.3841925677. The cubic root of 911640449 is about 969.6340593628.

The spelling of 911640449 in words is "nine hundred eleven million, six hundred forty thousand, four hundred forty-nine".