1949035851891 has 10 divisors (see below), whose sum is σ = 2911522692452. Its totient is φ = 1299357234540.

The previous prime is 1949035851839. The next prime is 1949035851913. The reversal of 1949035851891 is 1981585309491.

1949035851891 is a `hidden beast` number, since 1 + 9 + 49 + 0 + 3 + 585 + 1 + 8 + 9 + 1 = 666.

It is not a de Polignac number, because 1949035851891 - 2²³ = 1949027463283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1949035855891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 12031085425 + ... + 12031085586.

Almost surely, 2^{1949035851891} is an apocalyptic number.

1949035851891 is a deficient number, since it is larger than the sum of its proper divisors (962486840561).

1949035851891 is an equidigital number, since it uses as much as digits as its factorization.

1949035851891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24062171023 (or 24062171014 counting only the distinct ones).

The product of its (nonzero) digits is 13996800, while the sum is 63.

The spelling of 1949035851891 in words is "one trillion, nine hundred forty-nine billion, thirty-five million, eight hundred fifty-one thousand, eight hundred ninety-one".