1891124851 has 24 divisors (see below), whose sum is σ = 2380125440. Its totient is φ = 1470815280.

The previous prime is 1891124849. The next prime is 1891124881. The reversal of 1891124851 is 1584211981.

It is not a de Polignac number, because 1891124851 - 2¹ = 1891124849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1891124801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 522490 + ... + 526096.

Almost surely, 2^1891124851 is an apocalyptic number.

1891124851 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1891124851 is a deficient number, since it is larger than the sum of its proper divisors (489000589).

1891124851 is a wasteful number, since it uses less digits than its factorization.

1891124851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4255 (or 4244 counting only the distinct ones).

The product of its digits is 23040, while the sum is 40.

The square root of 1891124851 is about 43487.0653298196. The cubic root of 1891124851 is about 1236.6308234086.

The spelling of 1891124851 in words is "one billion, eight hundred ninety-one million, one hundred twenty-four thousand, eight hundred fifty-one".