685119031 has 2 divisors, whose sum is σ = 685119032. Its totient is φ = 685119030.

The previous prime is 685119011. The next prime is 685119037. The reversal of 685119031 is 130911586.

685119031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 685119031 - 2¹⁵ = 685086263 is a prime.

It is a super-2 number, since 2×685119031² = 938776173276757922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685119037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342559515 + 342559516.

It is an arithmetic number, because the mean of its divisors is an integer number (342559516).

Almost surely, 2^685119031 is an apocalyptic number.

685119031 is a deficient number, since it is larger than the sum of its proper divisors (1).

685119031 is an equidigital number, since it uses as much as digits as its factorization.

685119031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 685119031 is about 26174.7785281939. The cubic root of 685119031 is about 881.5670387141.

It can be divided in two parts, 685 and 119031, that added together give a square (119716 = 346²).

The spelling of 685119031 in words is "six hundred eighty-five million, one hundred nineteen thousand, thirty-one".