681219555 has 16 divisors (see below), whose sum is σ = 1095603360. Its totient is φ = 361433088.

The previous prime is 681219533. The next prime is 681219557. The reversal of 681219555 is 555912186.

It is a happy number.

681219555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 681219555 - 2⁸ = 681219299 is a prime.

It is a super-2 number, since 2×681219555² = 928120164228796050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (681219557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114760 + ... + 120549.

It is an arithmetic number, because the mean of its divisors is an integer number (68475210).

Almost surely, 2^681219555 is an apocalyptic number.

681219555 is a deficient number, since it is larger than the sum of its proper divisors (414383805).

681219555 is a wasteful number, since it uses less digits than its factorization.

681219555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235510.

The product of its digits is 108000, while the sum is 42.

The square root of 681219555 is about 26100.1830453351. The cubic root of 681219555 is about 879.8913239590.

The spelling of 681219555 in words is "six hundred eighty-one million, two hundred nineteen thousand, five hundred fifty-five".