499997550391 has 8 divisors (see below), whose sum is σ = 510694501824. Its totient is φ = 489303045120.

The previous prime is 499997550383. The next prime is 499997550499. The reversal of 499997550391 is 193055799994.

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 499997550391 - 2³ = 499997550383 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 499997550391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (499997550341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195370 + ... + 1018903.

It is an arithmetic number, because the mean of its divisors is an integer number (63836812728).

Almost surely, 2^499997550391 is an apocalyptic number.

499997550391 is the 447213-rd centered pentagonal number.

499997550391 is a deficient number, since it is larger than the sum of its proper divisors (10696951433).

499997550391 is a wasteful number, since it uses less digits than its factorization.

499997550391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1223081.

The product of its (nonzero) digits is 124002900, while the sum is 70.

The spelling of 499997550391 in words is "four hundred ninety-nine billion, nine hundred ninety-seven million, five hundred fifty thousand, three hundred ninety-one".