49907981 has 2 divisors, whose sum is σ = 49907982. Its totient is φ = 49907980.

The previous prime is 49907951. The next prime is 49907989. The reversal of 49907981 is 18970994.

49907981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28793956 + 21114025 = 5366^2 + 4595^2 .

It is a cyclic number.

It is not a de Polignac number, because 49907981 - 2⁶ = 49907917 is a prime.

It is a super-3 number, since 3×49907981³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49907989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24953990 + 24953991.

It is an arithmetic number, because the mean of its divisors is an integer number (24953991).

Almost surely, 2^49907981 is an apocalyptic number.

It is an amenable number.

49907981 is a deficient number, since it is larger than the sum of its proper divisors (1).

49907981 is an equidigital number, since it uses as much as digits as its factorization.

49907981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 49907981 is about 7064.5580895057. The cubic root of 49907981 is about 368.1770104835.

The spelling of 49907981 in words is "forty-nine million, nine hundred seven thousand, nine hundred eighty-one".