781727113 has 2 divisors, whose sum is σ = 781727114. Its totient is φ = 781727112.

The previous prime is 781727081. The next prime is 781727131. The reversal of 781727113 is 311727187.

Together with next prime (781727131) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 768564729 + 13162384 = 27723^2 + 3628^2 .

It is a cyclic number.

It is not a de Polignac number, because 781727113 - 2⁵ = 781727081 is a prime.

It is a super-2 number, since 2×781727113² = 1222194558398629538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (781727153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390863556 + 390863557.

It is an arithmetic number, because the mean of its divisors is an integer number (390863557).

Almost surely, 2^781727113 is an apocalyptic number.

It is an amenable number.

781727113 is a deficient number, since it is larger than the sum of its proper divisors (1).

781727113 is an equidigital number, since it uses as much as digits as its factorization.

781727113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16464, while the sum is 37.

The square root of 781727113 is about 27959.3832728835. The cubic root of 781727113 is about 921.1953244340.

The spelling of 781727113 in words is "seven hundred eighty-one million, seven hundred twenty-seven thousand, one hundred thirteen".