209080831 has 2 divisors, whose sum is σ = 209080832. Its totient is φ = 209080830.

The previous prime is 209080819. The next prime is 209080867. The reversal of 209080831 is 138080902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 209080831 - 2⁵ = 209080799 is a prime.

It is a super-2 number, since 2×209080831² = 87429587783301122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 209080793 and 209080802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209080231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104540415 + 104540416.

It is an arithmetic number, because the mean of its divisors is an integer number (104540416).

Almost surely, 2^209080831 is an apocalyptic number.

209080831 is a deficient number, since it is larger than the sum of its proper divisors (1).

209080831 is an equidigital number, since it uses as much as digits as its factorization.

209080831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 209080831 is about 14459.6276231444. The cubic root of 209080831 is about 593.5237096526.

The spelling of 209080831 in words is "two hundred nine million, eighty thousand, eight hundred thirty-one".