130731817 has 2 divisors, whose sum is σ = 130731818. Its totient is φ = 130731816.

The previous prime is 130731791. The next prime is 130731857. The reversal of 130731817 is 718137031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90839961 + 39891856 = 9531^2 + 6316^2 .

It is an emirp because it is prime and its reverse (718137031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 130731817 - 2¹⁹ = 130207529 is a prime.

It is a super-2 number, since 2×130731817² = 34181615952242978, which contains 22 as substring.

It is equal to p_7417318 and since 130731817 and 7417318 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (130731857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65365908 + 65365909.

It is an arithmetic number, because the mean of its divisors is an integer number (65365909).

Almost surely, 2^130731817 is an apocalyptic number.

It is an amenable number.

130731817 is a deficient number, since it is larger than the sum of its proper divisors (1).

130731817 is an equidigital number, since it uses as much as digits as its factorization.

130731817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 130731817 is about 11433.8015113085. The cubic root of 130731817 is about 507.5284971905.

Adding to 130731817 its reverse (718137031), we get a palindrome (848868848).

It can be divided in two parts, 1307 and 31817, that added together give a square (33124 = 182²).

The spelling of 130731817 in words is "one hundred thirty million, seven hundred thirty-one thousand, eight hundred seventeen".