785231857 has 2 divisors, whose sum is σ = 785231858. Its totient is φ = 785231856.

The previous prime is 785231809. The next prime is 785231897. The reversal of 785231857 is 758132587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 678915136 + 106316721 = 26056^2 + 10311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-785231857 is a prime.

It is not a weakly prime, because it can be changed into another prime (785231897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 392615928 + 392615929.

It is an arithmetic number, because the mean of its divisors is an integer number (392615929).

Almost surely, 2^785231857 is an apocalyptic number.

It is an amenable number.

785231857 is a deficient number, since it is larger than the sum of its proper divisors (1).

785231857 is an equidigital number, since it uses as much as digits as its factorization.

785231857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 470400, while the sum is 46.

The square root of 785231857 is about 28021.9888123595. The cubic root of 785231857 is about 922.5699477174.

The spelling of 785231857 in words is "seven hundred eighty-five million, two hundred thirty-one thousand, eight hundred fifty-seven".