449191691 has 6 divisors (see below), whose sum is σ = 486403020. Its totient is φ = 414638328.

The previous prime is 449191669. The next prime is 449191733. The reversal of 449191691 is 196191944.

It is not a de Polignac number, because 449191691 - 2²² = 444997387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (449191291) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1328801 + ... + 1329138.

It is an arithmetic number, because the mean of its divisors is an integer number (81067170).

Almost surely, 2^449191691 is an apocalyptic number.

449191691 is a deficient number, since it is larger than the sum of its proper divisors (37211329).

449191691 is a wasteful number, since it uses less digits than its factorization.

449191691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2657965 (or 2657952 counting only the distinct ones).

The product of its digits is 69984, while the sum is 44.

The square root of 449191691 is about 21194.1428465508. The cubic root of 449191691 is about 765.8503316124.

It can be divided in two parts, 44 and 9191691, that multiplied together give a palindrome (404434404).

The spelling of 449191691 in words is "four hundred forty-nine million, one hundred ninety-one thousand, six hundred ninety-one".