610788781 has 2 divisors, whose sum is σ = 610788782. Its totient is φ = 610788780.

The previous prime is 610788769. The next prime is 610788793. The reversal of 610788781 is 187887016.

It is a balanced prime because it is at equal distance from previous prime (610788769) and next prime (610788793).

It can be written as a sum of positive squares in only one way, i.e., 608066281 + 2722500 = 24659^2 + 1650^2 .

It is a cyclic number.

It is not a de Polignac number, because 610788781 - 2¹¹ = 610786733 is a prime.

It is a super-2 number, since 2×610788781² = 746125869990931922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (610788721) 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, 305394390 + 305394391.

It is an arithmetic number, because the mean of its divisors is an integer number (305394391).

Almost surely, 2^610788781 is an apocalyptic number.

610788781 is the 11053-rd centered decagonal number.

It is an amenable number.

610788781 is a deficient number, since it is larger than the sum of its proper divisors (1).

610788781 is an equidigital number, since it uses as much as digits as its factorization.

610788781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 150528, while the sum is 46.

The square root of 610788781 is about 24714.1413162586. The cubic root of 610788781 is about 848.4580029488.

The spelling of 610788781 in words is "six hundred ten million, seven hundred eighty-eight thousand, seven hundred eighty-one".