887242781 has 2 divisors, whose sum is σ = 887242782. Its totient is φ = 887242780.

The previous prime is 887242771. The next prime is 887242793. The reversal of 887242781 is 187242788.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 777852100 + 109390681 = 27890^2 + 10459^2 .

It is a cyclic number.

It is not a de Polignac number, because 887242781 - 2¹⁰ = 887241757 is a prime.

It is a super-2 number, since 2×887242781² = 1574399504873227922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (887242751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 443621390 + 443621391.

It is an arithmetic number, because the mean of its divisors is an integer number (443621391).

Almost surely, 2^887242781 is an apocalyptic number.

It is an amenable number.

887242781 is a deficient number, since it is larger than the sum of its proper divisors (1).

887242781 is an equidigital number, since it uses as much as digits as its factorization.

887242781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 401408, while the sum is 47.

The square root of 887242781 is about 29786.6208388934. The cubic root of 887242781 is about 960.9058221849.

The spelling of 887242781 in words is "eight hundred eighty-seven million, two hundred forty-two thousand, seven hundred eighty-one".