1650683821 has 8 divisors (see below), whose sum is σ = 1691767224. Its totient is φ = 1609639680.

The previous prime is 1650683809. The next prime is 1650683861. The reversal of 1650683821 is 1283860561.

It can be written as a sum of positive squares in 4 ways, for example, as 117961321 + 1532722500 = 10861^2 + 39150^2 .

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 1650683821 - 2¹³ = 1650675629 is a prime.

It is a super-2 number, since 2×1650683821² = 5449514153822320082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1650683861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87025 + ... + 104281.

It is an arithmetic number, because the mean of its divisors is an integer number (211470903).

Almost surely, 2^1650683821 is an apocalyptic number.

It is an amenable number.

1650683821 is a deficient number, since it is larger than the sum of its proper divisors (41083403).

1650683821 is a wasteful number, since it uses less digits than its factorization.

1650683821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19631.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 1650683821 is about 40628.6084059004. The cubic root of 1650683821 is about 1181.8289699125.

The spelling of 1650683821 in words is "one billion, six hundred fifty million, six hundred eighty-three thousand, eight hundred twenty-one".