130781639 has 2 divisors, whose sum is σ = 130781640. Its totient is φ = 130781638.

The previous prime is 130781627. The next prime is 130781659. The reversal of 130781639 is 936187031.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-130781639 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (130781659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65390819 + 65390820.

It is an arithmetic number, because the mean of its divisors is an integer number (65390820).

Almost surely, 2^130781639 is an apocalyptic number.

130781639 is a deficient number, since it is larger than the sum of its proper divisors (1).

130781639 is an equidigital number, since it uses as much as digits as its factorization.

130781639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 130781639 is about 11435.9800192200. The cubic root of 130781639 is about 507.5929621740.

The spelling of 130781639 in words is "one hundred thirty million, seven hundred eighty-one thousand, six hundred thirty-nine".