870857137 has 2 divisors, whose sum is σ = 870857138. Its totient is φ = 870857136.

The previous prime is 870857131. The next prime is 870857159. The reversal of 870857137 is 731758078.

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., 718186401 + 152670736 = 26799^2 + 12356^2 .

It is a cyclic number.

It is not a de Polignac number, because 870857137 - 2¹⁹ = 870332849 is a prime.

It is not a weakly prime, because it can be changed into another prime (870857131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435428568 + 435428569.

It is an arithmetic number, because the mean of its divisors is an integer number (435428569).

Almost surely, 2^870857137 is an apocalyptic number.

It is an amenable number.

870857137 is a deficient number, since it is larger than the sum of its proper divisors (1).

870857137 is an equidigital number, since it uses as much as digits as its factorization.

870857137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 329280, while the sum is 46.

The square root of 870857137 is about 29510.2886634475. The cubic root of 870857137 is about 954.9536766544.

The spelling of 870857137 in words is "eight hundred seventy million, eight hundred fifty-seven thousand, one hundred thirty-seven".