867881257 has 2 divisors, whose sum is σ = 867881258. Its totient is φ = 867881256.

The previous prime is 867881243. The next prime is 867881291. The reversal of 867881257 is 752188768.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 846868201 + 21013056 = 29101^2 + 4584^2 .

It is a cyclic number.

It is not a de Polignac number, because 867881257 - 2⁷ = 867881129 is a prime.

It is not a weakly prime, because it can be changed into another prime (867881207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433940628 + 433940629.

It is an arithmetic number, because the mean of its divisors is an integer number (433940629).

Almost surely, 2^867881257 is an apocalyptic number.

It is an amenable number.

867881257 is a deficient number, since it is larger than the sum of its proper divisors (1).

867881257 is an equidigital number, since it uses as much as digits as its factorization.

867881257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1505280, while the sum is 52.

The square root of 867881257 is about 29459.8244563677. The cubic root of 867881257 is about 953.8646841348.

The spelling of 867881257 in words is "eight hundred sixty-seven million, eight hundred eighty-one thousand, two hundred fifty-seven".