161302831 has 2 divisors, whose sum is σ = 161302832. Its totient is φ = 161302830.

The previous prime is 161302819. The next prime is 161302853. The reversal of 161302831 is 138203161.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161302831 is a prime.

It is a super-2 number, since 2×161302831² = 52037206577229122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161302796 and 161302805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161302811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80651415 + 80651416.

It is an arithmetic number, because the mean of its divisors is an integer number (80651416).

Almost surely, 2^161302831 is an apocalyptic number.

161302831 is a deficient number, since it is larger than the sum of its proper divisors (1).

161302831 is an equidigital number, since it uses as much as digits as its factorization.

161302831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 161302831 is about 12700.5051474341. The cubic root of 161302831 is about 544.3530532871.

Adding to 161302831 its reverse (138203161), we get a palindrome (299505992).

The spelling of 161302831 in words is "one hundred sixty-one million, three hundred two thousand, eight hundred thirty-one".