499981347391 has 8 divisors (see below), whose sum is σ = 524570595968. Its totient is φ = 475920900000.

The previous prime is 499981347389. The next prime is 499981347403. The reversal of 499981347391 is 193743189994.

499981347391 = T₅₇₇₃₃₈ + T₅₇₇₃₃₉ + T₅₇₇₃₄₀.

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

It is a cyclic number.

It is not a de Polignac number, because 499981347391 - 2¹ = 499981347389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (499981347091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132198360 + ... + 132202141.

It is an arithmetic number, because the mean of its divisors is an integer number (65571324496).

Almost surely, 2^499981347391 is an apocalyptic number.

499981347391 is the 577340-th centered triangular number.

499981347391 is a deficient number, since it is larger than the sum of its proper divisors (24589248577).

499981347391 is a wasteful number, since it uses less digits than its factorization.

499981347391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264400593.

The product of its digits is 52907904, while the sum is 67.

The spelling of 499981347391 in words is "four hundred ninety-nine billion, nine hundred eighty-one million, three hundred forty-seven thousand, three hundred ninety-one".