49179621917 has 2 divisors, whose sum is σ = 49179621918. Its totient is φ = 49179621916.

The previous prime is 49179621857. The next prime is 49179621919. The reversal of 49179621917 is 71912697194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45663843481 + 3515778436 = 213691^2 + 59294^2 .

It is a cyclic number.

It is not a de Polignac number, because 49179621917 - 2⁸ = 49179621661 is a prime.

Together with 49179621919, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49179621919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24589810958 + 24589810959.

It is an arithmetic number, because the mean of its divisors is an integer number (24589810959).

Almost surely, 2^49179621917 is an apocalyptic number.

It is an amenable number.

49179621917 is a deficient number, since it is larger than the sum of its proper divisors (1).

49179621917 is an equidigital number, since it uses as much as digits as its factorization.

49179621917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1714608, while the sum is 56.

The spelling of 49179621917 in words is "forty-nine billion, one hundred seventy-nine million, six hundred twenty-one thousand, nine hundred seventeen".