650897821 has 12 divisors (see below), whose sum is σ = 777632988. Its totient is φ = 542832192.

The previous prime is 650897813. The next prime is 650897843. The reversal of 650897821 is 128798056.

It can be written as a sum of positive squares in 2 ways, for example, as 238239225 + 412658596 = 15435^2 + 20314^2 .

It is not a de Polignac number, because 650897821 - 2³ = 650897813 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 (650897881) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 177696 + ... + 181321.

It is an arithmetic number, because the mean of its divisors is an integer number (64802749).

Almost surely, 2^650897821 is an apocalyptic number.

It is an amenable number.

650897821 is a deficient number, since it is larger than the sum of its proper divisors (126735167).

650897821 is a wasteful number, since it uses less digits than its factorization.

650897821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359068 (or 359061 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 46.

The square root of 650897821 is about 25512.6992103932. The cubic root of 650897821 is about 866.6377565471.

It can be divided in two parts, 6508 and 97821, that added together give a square (104329 = 323²).

The spelling of 650897821 in words is "six hundred fifty million, eight hundred ninety-seven thousand, eight hundred twenty-one".