499981500091 has 2 divisors, whose sum is σ = 499981500092. Its totient is φ = 499981500090.

The previous prime is 499981500023. The next prime is 499981500101. The reversal of 499981500091 is 190005189994.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 499981500091 - 2¹³ = 499981491899 is a prime.

It is not a weakly prime, because it can be changed into another prime (499981500191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249990750045 + 249990750046.

It is an arithmetic number, because the mean of its divisors is an integer number (249990750046).

Almost surely, 2^499981500091 is an apocalyptic number.

499981500091 is a deficient number, since it is larger than the sum of its proper divisors (1).

499981500091 is an equidigital number, since it uses as much as digits as its factorization.

499981500091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1049760, while the sum is 55.

The spelling of 499981500091 in words is "four hundred ninety-nine billion, nine hundred eighty-one million, five hundred thousand, ninety-one".