49721251 has 2 divisors, whose sum is σ = 49721252. Its totient is φ = 49721250.

The previous prime is 49721213. The next prime is 49721267. The reversal of 49721251 is 15212794.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-49721251 is a prime.

It is not a weakly prime, because it can be changed into another prime (49721851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24860625 + 24860626.

It is an arithmetic number, because the mean of its divisors is an integer number (24860626).

Almost surely, 2^49721251 is an apocalyptic number.

49721251 is a deficient number, since it is larger than the sum of its proper divisors (1).

49721251 is an equidigital number, since it uses as much as digits as its factorization.

49721251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 31.

The square root of 49721251 is about 7051.3297327525. The cubic root of 49721251 is about 367.7172602761.

The spelling of 49721251 in words is "forty-nine million, seven hundred twenty-one thousand, two hundred fifty-one".