1881123257 has 8 divisors (see below), whose sum is σ = 2026800384. Its totient is φ = 1735585488.

The previous prime is 1881123229. The next prime is 1881123271. The reversal of 1881123257 is 7523211881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1881123257 - 2¹⁶ = 1881057721 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1881123257.

It is not an unprimeable number, because it can be changed into a prime (1881123227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5903 + ... + 61620.

It is an arithmetic number, because the mean of its divisors is an integer number (253350048).

Almost surely, 2^1881123257 is an apocalyptic number.

It is an amenable number.

1881123257 is a deficient number, since it is larger than the sum of its proper divisors (145677127).

1881123257 is a wasteful number, since it uses less digits than its factorization.

1881123257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69679.

The product of its digits is 26880, while the sum is 38.

The square root of 1881123257 is about 43371.9178386200. The cubic root of 1881123257 is about 1234.4469119389.

The spelling of 1881123257 in words is "one billion, eight hundred eighty-one million, one hundred twenty-three thousand, two hundred fifty-seven".