681269999 has 4 divisors (see below), whose sum is σ = 681434880. Its totient is φ = 681105120.

The previous prime is 681269983. The next prime is 681270047. The reversal of 681269999 is 999962186.

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 681269999 - 2⁴ = 681269983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681269929) 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, 76079 + ... + 84560.

It is an arithmetic number, because the mean of its divisors is an integer number (170358720).

Almost surely, 2^681269999 is an apocalyptic number.

681269999 is a deficient number, since it is larger than the sum of its proper divisors (164881).

681269999 is a wasteful number, since it uses less digits than its factorization.

681269999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164880.

The product of its digits is 3779136, while the sum is 59.

The square root of 681269999 is about 26101.1493808223. The cubic root of 681269999 is about 879.9130419412.

It can be divided in two parts, 68126 and 9999, that added together give a 7-th power (78125 = 5⁷).

The spelling of 681269999 in words is "six hundred eighty-one million, two hundred sixty-nine thousand, nine hundred ninety-nine".