499991961 has 8 divisors (see below), whose sum is σ = 761892544. Its totient is φ = 285709680.

The previous prime is 499991951. The next prime is 499991977. The reversal of 499991961 is 169199994.

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

It is not a de Polignac number, because 499991961 - 2¹³ = 499983769 is a prime.

It is a super-2 number, since 2×499991961² = 499983922129251042, which contains 22 as substring.

It is the 22361-st Hogben number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (499991911) by changing a digit.

It is a nontrivial repunit in base 22360.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11904550 + ... + 11904591.

It is an arithmetic number, because the mean of its divisors is an integer number (95236568).

Almost surely, 2^499991961 is an apocalyptic number.

It is an amenable number.

499991961 is a deficient number, since it is larger than the sum of its proper divisors (261900583).

499991961 is a wasteful number, since it uses less digits than its factorization.

499991961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23809151.

The product of its digits is 1417176, while the sum is 57.

The square root of 499991961 is about 22360.5000167706. The cubic root of 499991961 is about 793.6962722556.

The spelling of 499991961 in words is "four hundred ninety-nine million, nine hundred ninety-one thousand, nine hundred sixty-one".