130629781 has 4 divisors (see below), whose sum is σ = 130676832. Its totient is φ = 130582732.

The previous prime is 130629757. The next prime is 130629797. The reversal of 130629781 is 187926031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 187926031 = 23 ⋅8170697.

It is a cyclic number.

It is not a de Polignac number, because 130629781 - 2⁵ = 130629749 is a prime.

It is a super-2 number, since 2×130629781² = 34128279368215922, 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 130629781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130629881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19081 + ... + 25006.

It is an arithmetic number, because the mean of its divisors is an integer number (32669208).

Almost surely, 2^130629781 is an apocalyptic number.

It is an amenable number.

130629781 is a deficient number, since it is larger than the sum of its proper divisors (47051).

130629781 is an equidigital number, since it uses as much as digits as its factorization.

130629781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47050.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 130629781 is about 11429.3386072861. The cubic root of 130629781 is about 507.3964210625.

The spelling of 130629781 in words is "one hundred thirty million, six hundred twenty-nine thousand, seven hundred eighty-one".