49887781 has 2 divisors, whose sum is σ = 49887782. Its totient is φ = 49887780.

The previous prime is 49887769. The next prime is 49887797. The reversal of 49887781 is 18778894.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44435556 + 5452225 = 6666^2 + 2335^2 .

It is a cyclic number.

It is not a de Polignac number, because 49887781 - 2⁹ = 49887269 is a prime.

It is a super-2 number, since 2×49887781² = 4977581386207922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49887701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24943890 + 24943891.

It is an arithmetic number, because the mean of its divisors is an integer number (24943891).

Almost surely, 2^49887781 is an apocalyptic number.

It is an amenable number.

49887781 is a deficient number, since it is larger than the sum of its proper divisors (1).

49887781 is an equidigital number, since it uses as much as digits as its factorization.

49887781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 903168, while the sum is 52.

The square root of 49887781 is about 7063.1282729397. The cubic root of 49887781 is about 368.1273311932.

It can be divided in two parts, 4988 and 7781, that added together give a square (12769 = 113²).

The spelling of 49887781 in words is "forty-nine million, eight hundred eighty-seven thousand, seven hundred eighty-one".