130081781 has 2 divisors, whose sum is σ = 130081782. Its totient is φ = 130081780.

The previous prime is 130081747. The next prime is 130081801. The reversal of 130081781 is 187180031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75099556 + 54982225 = 8666^2 + 7415^2 .

It is an emirp because it is prime and its reverse (187180031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 130081781 - 2¹⁸ = 129819637 is a prime.

It is a super-2 number, since 2×130081781² = 33842539496263922, which contains 22 as substring.

It is equal to p_7382522 and since 130081781 and 7382522 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (130081741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65040890 + 65040891.

It is an arithmetic number, because the mean of its divisors is an integer number (65040891).

Almost surely, 2^130081781 is an apocalyptic number.

It is an amenable number.

130081781 is a deficient number, since it is larger than the sum of its proper divisors (1).

130081781 is an equidigital number, since it uses as much as digits as its factorization.

130081781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 29.

The square root of 130081781 is about 11405.3400212357. The cubic root of 130081781 is about 506.6859068082.

The spelling of 130081781 in words is "one hundred thirty million, eighty-one thousand, seven hundred eighty-one".