681210511 has 4 divisors (see below), whose sum is σ = 682682272. Its totient is φ = 679738752.

The previous prime is 681210499. The next prime is 681210521. The reversal of 681210511 is 115012186.

It is a happy number.

681210511 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 681210511 - 2²¹ = 679113359 is a prime.

It is a super-2 number, since 2×681210511² = 928095520593762242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681210521) 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, 735186 + ... + 736111.

It is an arithmetic number, because the mean of its divisors is an integer number (170670568).

Almost surely, 2^681210511 is an apocalyptic number.

681210511 is a deficient number, since it is larger than the sum of its proper divisors (1471761).

681210511 is a wasteful number, since it uses less digits than its factorization.

681210511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1471760.

The product of its (nonzero) digits is 480, while the sum is 25.

The square root of 681210511 is about 26100.0097892702. The cubic root of 681210511 is about 879.8874300738.

Adding to 681210511 its reverse (115012186), we get a palindrome (796222697).

The spelling of 681210511 in words is "six hundred eighty-one million, two hundred ten thousand, five hundred eleven".