49657981 has 2 divisors, whose sum is σ = 49657982. Its totient is φ = 49657980.

The previous prime is 49657973. The next prime is 49657997. The reversal of 49657981 is 18975694.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48372025 + 1285956 = 6955^2 + 1134^2 .

It is a cyclic number.

It is not a de Polignac number, because 49657981 - 2³ = 49657973 is a prime.

It is a super-2 number, since 2×49657981² = 4931830153992722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49657481) 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, 24828990 + 24828991.

It is an arithmetic number, because the mean of its divisors is an integer number (24828991).

Almost surely, 2^49657981 is an apocalyptic number.

It is an amenable number.

49657981 is a deficient number, since it is larger than the sum of its proper divisors (1).

49657981 is an equidigital number, since it uses as much as digits as its factorization.

49657981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 49.

The square root of 49657981 is about 7046.8419167738. The cubic root of 49657981 is about 367.5612213862.

The spelling of 49657981 in words is "forty-nine million, six hundred fifty-seven thousand, nine hundred eighty-one".