681236049 has 16 divisors (see below), whose sum is σ = 981327872. Its totient is φ = 417875328.

The previous prime is 681236041. The next prime is 681236107. The reversal of 681236049 is 940632186.

It is not a de Polignac number, because 681236049 - 2³ = 681236041 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 681235998 and 681236016.

It is not an unprimeable number, because it can be changed into a prime (681236041) 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, 15697 + ... + 40110.

It is an arithmetic number, because the mean of its divisors is an integer number (61332992).

Almost surely, 2^681236049 is an apocalyptic number.

It is an amenable number.

681236049 is a deficient number, since it is larger than the sum of its proper divisors (300091823).

681236049 is a wasteful number, since it uses less digits than its factorization.

681236049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56136.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 681236049 is about 26100.4990182180. The cubic root of 681236049 is about 879.8984253457.

The spelling of 681236049 in words is "six hundred eighty-one million, two hundred thirty-six thousand, forty-nine".