650981 has 8 divisors (see below), whose sum is σ = 696600. Its totient is φ = 606208.

The previous prime is 650971. The next prime is 650987. The reversal of 650981 is 189056.

It can be written as a sum of positive squares in 4 ways, for example, as 240100 + 410881 = 490^2 + 641^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 650981 - 2⁶ = 650917 is a prime.

It is a super-2 number, since 2×650981² = 847552524722, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 650981.

It is not an unprimeable number, because it can be changed into a prime (650987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2405 + ... + 2661.

It is an arithmetic number, because the mean of its divisors is an integer number (87075).

2⁶⁵⁰⁹⁸¹ is an apocalyptic number.

It is an amenable number.

650981 is a deficient number, since it is larger than the sum of its proper divisors (45619).

650981 is a wasteful number, since it uses less digits than its factorization.

650981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 650981 is about 806.8339358257. The cubic root of 650981 is about 86.6674671195.

The spelling of 650981 in words is "six hundred fifty thousand, nine hundred eighty-one".