49319987 has 2 divisors, whose sum is σ = 49319988. Its totient is φ = 49319986.

The previous prime is 49319983. The next prime is 49319989. The reversal of 49319987 is 78991394.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 49319987 - 2² = 49319983 is a prime.

It is a super-2 number, since 2×49319987² = 4864922235360338, which contains 22 as substring.

Together with 49319989, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (49319983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24659993 + 24659994.

It is an arithmetic number, because the mean of its divisors is an integer number (24659994).

Almost surely, 2^49319987 is an apocalyptic number.

49319987 is a deficient number, since it is larger than the sum of its proper divisors (1).

49319987 is an equidigital number, since it uses as much as digits as its factorization.

49319987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 50.

The square root of 49319987 is about 7022.8190208776. The cubic root of 49319987 is about 366.7253945418.

The spelling of 49319987 in words is "forty-nine million, three hundred nineteen thousand, nine hundred eighty-seven".