49979999 has 2 divisors, whose sum is σ = 49980000. Its totient is φ = 49979998.

The previous prime is 49979977. The next prime is 49980001. The reversal of 49979999 is 99997994.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 49979999 - 2²⁴ = 33202783 is a prime.

It is a Sophie Germain prime.

Together with 49980001, it forms a pair of twin primes.

It is a Chen prime.

49979999 is a modest number, since divided by 9999 gives 4997 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49979939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24989999 + 24990000.

It is an arithmetic number, because the mean of its divisors is an integer number (24990000).

Almost surely, 2^49979999 is an apocalyptic number.

49979999 is a deficient number, since it is larger than the sum of its proper divisors (1).

49979999 is an equidigital number, since it uses as much as digits as its factorization.

49979999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14880348, while the sum is 65.

The square root of 49979999 is about 7069.6533861286. The cubic root of 49979999 is about 368.3540204365.

The spelling of 49979999 in words is "forty-nine million, nine hundred seventy-nine thousand, nine hundred ninety-nine".