130432781 has 2 divisors, whose sum is σ = 130432782. Its totient is φ = 130432780.

The previous prime is 130432741. The next prime is 130432787. The reversal of 130432781 is 187234031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129846025 + 586756 = 11395^2 + 766^2 .

It is an emirp because it is prime and its reverse (187234031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 130432781 - 2¹⁴ = 130416397 is a prime.

It is a super-2 number, since 2×130432781² = 34025420718787922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (130432787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65216390 + 65216391.

It is an arithmetic number, because the mean of its divisors is an integer number (65216391).

Almost surely, 2^130432781 is an apocalyptic number.

130432781 is the 5108-th centered decagonal number.

It is an amenable number.

130432781 is a deficient number, since it is larger than the sum of its proper divisors (1).

130432781 is an equidigital number, since it uses as much as digits as its factorization.

130432781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 130432781 is about 11420.7171841352. The cubic root of 130432781 is about 507.1412281449.

The spelling of 130432781 in words is "one hundred thirty million, four hundred thirty-two thousand, seven hundred eighty-one".