1418061781 has 2 divisors, whose sum is σ = 1418061782. Its totient is φ = 1418061780.

The previous prime is 1418061779. The next prime is 1418061791. The reversal of 1418061781 is 1871608141.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1210413681 + 207648100 = 34791^2 + 14410^2 .

It is a cyclic number.

It is not a de Polignac number, because 1418061781 - 2¹ = 1418061779 is a prime.

It is a super-2 number, since 2×1418061781² = 4021798429465783922, which contains 22 as substring.

Together with 1418061779, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1418061781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1418061731) 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 as a sum of consecutive naturals, namely, 709030890 + 709030891.

It is an arithmetic number, because the mean of its divisors is an integer number (709030891).

Almost surely, 2^1418061781 is an apocalyptic number.

It is an amenable number.

1418061781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1418061781 is an equidigital number, since it uses as much as digits as its factorization.

1418061781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 37.

The square root of 1418061781 is about 37657.1610852438. The cubic root of 1418061781 is about 1123.4792372911.

The spelling of 1418061781 in words is "one billion, four hundred eighteen million, sixty-one thousand, seven hundred eighty-one".