130402781 has 4 divisors (see below), whose sum is σ = 130572252. Its totient is φ = 130233312.

The previous prime is 130402777. The next prime is 130402793. The reversal of 130402781 is 187204031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 187204031 = 7 ⋅26743433.

It can be written as a sum of positive squares in 2 ways, for example, as 47045881 + 83356900 = 6859^2 + 9130^2 .

It is a cyclic number.

It is not a de Polignac number, because 130402781 - 2² = 130402777 is a prime.

It is a super-2 number, since 2×130402781² = 34009770585067922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 130402781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130402081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83576 + ... + 85121.

It is an arithmetic number, because the mean of its divisors is an integer number (32643063).

Almost surely, 2^130402781 is an apocalyptic number.

It is an amenable number.

130402781 is a deficient number, since it is larger than the sum of its proper divisors (169471).

130402781 is an equidigital number, since it uses as much as digits as its factorization.

130402781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169470.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 130402781 is about 11419.4037059734. The cubic root of 130402781 is about 507.1023437394.

The spelling of 130402781 in words is "one hundred thirty million, four hundred two thousand, seven hundred eighty-one".