5125781998 has 4 divisors (see below), whose sum is σ = 7688673000. Its totient is φ = 2562890998.

The previous prime is 5125781971. The next prime is 5125782031. The reversal of 5125781998 is 8991875215.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1281445498 + ... + 1281445501.

It is an arithmetic number, because the mean of its divisors is an integer number (1922168250).

Almost surely, 2^5125781998 is an apocalyptic number.

5125781998 is a deficient number, since it is larger than the sum of its proper divisors (2562891002).

5125781998 is a wasteful number, since it uses less digits than its factorization.

5125781998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2562891001.

The product of its digits is 1814400, while the sum is 55.

The square root of 5125781998 is about 71594.5668189982. The cubic root of 5125781998 is about 1724.1963067556.

The spelling of 5125781998 in words is "five billion, one hundred twenty-five million, seven hundred eighty-one thousand, nine hundred ninety-eight".