49965781 has 2 divisors, whose sum is σ = 49965782. Its totient is φ = 49965780.

The previous prime is 49965779. The next prime is 49965787. The reversal of 49965781 is 18756994.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42315025 + 7650756 = 6505^2 + 2766^2 .

It is a cyclic number.

It is not a de Polignac number, because 49965781 - 2¹ = 49965779 is a prime.

It is a super-2 number, since 2×49965781² = 4993158541879922, which contains 22 as substring.

Together with 49965779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49965787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24982890 + 24982891.

It is an arithmetic number, because the mean of its divisors is an integer number (24982891).

Almost surely, 2^49965781 is an apocalyptic number.

It is an amenable number.

49965781 is a deficient number, since it is larger than the sum of its proper divisors (1).

49965781 is an equidigital number, since it uses as much as digits as its factorization.

49965781 is an evil number, because the sum of its binary digits is even.

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

The square root of 49965781 is about 7068.6477490394. The cubic root of 49965781 is about 368.3190881018.

The spelling of 49965781 in words is "forty-nine million, nine hundred sixty-five thousand, seven hundred eighty-one".