49191979 has 2 divisors, whose sum is σ = 49191980. Its totient is φ = 49191978.

The previous prime is 49191977. The next prime is 49191983. The reversal of 49191979 is 97919194.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 49191979 - 2¹ = 49191977 is a prime.

Together with 49191977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (49191973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24595989 + 24595990.

It is an arithmetic number, because the mean of its divisors is an integer number (24595990).

Almost surely, 2^49191979 is an apocalyptic number.

49191979 is a deficient number, since it is larger than the sum of its proper divisors (1).

49191979 is an equidigital number, since it uses as much as digits as its factorization.

49191979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 183708, while the sum is 49.

The square root of 49191979 is about 7013.6993804981. The cubic root of 49191979 is about 366.4078460902.

The spelling of 49191979 in words is "forty-nine million, one hundred ninety-one thousand, nine hundred seventy-nine".