291626404139 has 4 divisors (see below), whose sum is σ = 333287319024. Its totient is φ = 249965489256.

The previous prime is 291626404081. The next prime is 291626404141. The reversal of 291626404139 is 931404626192.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-291626404139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 291626404093 and 291626404102.

It is not an unprimeable number, because it can be changed into a prime (291626404339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20830457432 + ... + 20830457445.

It is an arithmetic number, because the mean of its divisors is an integer number (83321829756).

Almost surely, 2^291626404139 is an apocalyptic number.

291626404139 is a deficient number, since it is larger than the sum of its proper divisors (41660914885).

291626404139 is an equidigital number, since it uses as much as digits as its factorization.

291626404139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41660914884.

The product of its (nonzero) digits is 559872, while the sum is 47.

The spelling of 291626404139 in words is "two hundred ninety-one billion, six hundred twenty-six million, four hundred four thousand, one hundred thirty-nine".