249938963819 has 4 divisors (see below), whose sum is σ = 249940692696. Its totient is φ = 249937234944.

The previous prime is 249938963809. The next prime is 249938963821. The reversal of 249938963819 is 918369839942.

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

It is a cyclic number.

It is not a de Polignac number, because 249938963819 - 2⁴ = 249938963803 is a prime.

It is a super-2 number, since 2×249938963819² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249938963809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 625589 + ... + 944054.

It is an arithmetic number, because the mean of its divisors is an integer number (62485173174).

Almost surely, 2^249938963819 is an apocalyptic number.

249938963819 is a deficient number, since it is larger than the sum of its proper divisors (1728877).

249938963819 is a wasteful number, since it uses less digits than its factorization.

249938963819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1728876.

The product of its digits is 181398528, while the sum is 71.

The spelling of 249938963819 in words is "two hundred forty-nine billion, nine hundred thirty-eight million, nine hundred sixty-three thousand, eight hundred nineteen".