49721851 has 2 divisors, whose sum is σ = 49721852. Its totient is φ = 49721850.

The previous prime is 49721849. The next prime is 49721869. The reversal of 49721851 is 15812794.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 49721851 - 2¹ = 49721849 is a prime.

Together with 49721849, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 49721851.

It is not a weakly prime, because it can be changed into another prime (49721801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24860925 + 24860926.

It is an arithmetic number, because the mean of its divisors is an integer number (24860926).

Almost surely, 2^49721851 is an apocalyptic number.

49721851 is a deficient number, since it is larger than the sum of its proper divisors (1).

49721851 is an equidigital number, since it uses as much as digits as its factorization.

49721851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 37.

The square root of 49721851 is about 7051.3722777910. The cubic root of 49721851 is about 367.7187393853.

The spelling of 49721851 in words is "forty-nine million, seven hundred twenty-one thousand, eight hundred fifty-one".