1650021061 has 4 divisors (see below), whose sum is σ = 1776945772. Its totient is φ = 1523096352.

The previous prime is 1650021053. The next prime is 1650021101. The reversal of 1650021061 is 1601200561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1601200561 = 31 ⋅51651631.

It can be written as a sum of positive squares in 2 ways, for example, as 499522500 + 1150498561 = 22350^2 + 33919^2 .

It is a cyclic number.

It is not a de Polignac number, because 1650021061 - 2³ = 1650021053 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 (1650021001) 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, 63462336 + ... + 63462361.

It is an arithmetic number, because the mean of its divisors is an integer number (444236443).

Almost surely, 2^1650021061 is an apocalyptic number.

It is an amenable number.

1650021061 is a deficient number, since it is larger than the sum of its proper divisors (126924711).

1650021061 is a wasteful number, since it uses less digits than its factorization.

1650021061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126924710.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 1650021061 is about 40620.4512653417. The cubic root of 1650021061 is about 1181.6707781355.

The spelling of 1650021061 in words is "one billion, six hundred fifty million, twenty-one thousand, sixty-one".