1650627421 has 4 divisors (see below), whose sum is σ = 1652554332. Its totient is φ = 1648700512.

The previous prime is 1650627409. The next prime is 1650627437. The reversal of 1650627421 is 1247260561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1247260561 = 25373 ⋅49157.

It can be written as a sum of positive squares in 2 ways, for example, as 1565784900 + 84842521 = 39570^2 + 9211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1650627421 is a prime.

It is a super-2 number, since 2×1650627421² = 5449141765914222482, 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 (1650627721) 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, 962170 + ... + 963883.

It is an arithmetic number, because the mean of its divisors is an integer number (413138583).

Almost surely, 2^1650627421 is an apocalyptic number.

It is an amenable number.

1650627421 is a deficient number, since it is larger than the sum of its proper divisors (1926911).

1650627421 is an equidigital number, since it uses as much as digits as its factorization.

1650627421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1926910.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 1650627421 is about 40627.9143077761. The cubic root of 1650627421 is about 1181.8155096499.

Adding to 1650627421 its reverse (1247260561), we get a palindrome (2897887982).

The spelling of 1650627421 in words is "one billion, six hundred fifty million, six hundred twenty-seven thousand, four hundred twenty-one".