4997719781 has 4 divisors (see below), whose sum is σ = 4998046464. Its totient is φ = 4997393100.

The previous prime is 4997719757. The next prime is 4997719807. The reversal of 4997719781 is 1879177994.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4997719781 - 2¹⁴ = 4997703397 is a prime.

It is a super-2 number, since 2×4997719781² = 49954406018797375922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4997719711) 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 3 ways as a sum of consecutive naturals, for example, 139205 + ... + 171386.

It is an arithmetic number, because the mean of its divisors is an integer number (1249511616).

Almost surely, 2^4997719781 is an apocalyptic number.

It is an amenable number.

4997719781 is a deficient number, since it is larger than the sum of its proper divisors (326683).

4997719781 is a wasteful number, since it uses less digits than its factorization.

4997719781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326682.

The product of its digits is 8001504, while the sum is 62.

The square root of 4997719781 is about 70694.5526967955. The cubic root of 4997719781 is about 1709.7159658423.

The spelling of 4997719781 in words is "four billion, nine hundred ninety-seven million, seven hundred nineteen thousand, seven hundred eighty-one".