650723881 has 4 divisors (see below), whose sum is σ = 653565700. Its totient is φ = 647882064.

The previous prime is 650723863. The next prime is 650723893. The reversal of 650723881 is 188327056.

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

It can be written as a sum of positive squares in 2 ways, for example, as 257891481 + 392832400 = 16059^2 + 19820^2 .

It is a cyclic number.

It is not a de Polignac number, because 650723881 - 2⁷ = 650723753 is a prime.

It is a super-2 number, since 2×650723881² = 846883138607404322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (650723851) 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, 1420566 + ... + 1421023.

It is an arithmetic number, because the mean of its divisors is an integer number (163391425).

Almost surely, 2^650723881 is an apocalyptic number.

It is an amenable number.

650723881 is a deficient number, since it is larger than the sum of its proper divisors (2841819).

650723881 is a wasteful number, since it uses less digits than its factorization.

650723881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2841818.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 650723881 is about 25509.2900920429. The cubic root of 650723881 is about 866.5605522117.

The spelling of 650723881 in words is "six hundred fifty million, seven hundred twenty-three thousand, eight hundred eighty-one".