130557781 has 2 divisors, whose sum is σ = 130557782. Its totient is φ = 130557780.

The previous prime is 130557769. The next prime is 130557839. The reversal of 130557781 is 187755031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107122500 + 23435281 = 10350^2 + 4841^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-130557781 is a prime.

It is a super-2 number, since 2×130557781² = 34090668359287922, which contains 22 as substring.

It is equal to p_7407919 and since 130557781 and 7407919 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 130557781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (130557181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65278890 + 65278891.

It is an arithmetic number, because the mean of its divisors is an integer number (65278891).

Almost surely, 2^130557781 is an apocalyptic number.

It is an amenable number.

130557781 is a deficient number, since it is larger than the sum of its proper divisors (1).

130557781 is an equidigital number, since it uses as much as digits as its factorization.

130557781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29400, while the sum is 37.

The square root of 130557781 is about 11426.1883845839. The cubic root of 130557781 is about 507.3031823537.

The spelling of 130557781 in words is "one hundred thirty million, five hundred fifty-seven thousand, seven hundred eighty-one".