1650051721 has 2 divisors, whose sum is σ = 1650051722. Its totient is φ = 1650051720.

The previous prime is 1650051659. The next prime is 1650051727. The reversal of 1650051721 is 1271500561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1588899321 + 61152400 = 39861^2 + 7820^2 .

It is a cyclic number.

It is not a de Polignac number, because 1650051721 - 2²³ = 1641663113 is a prime.

It is a super-3 number, since 3×1650051721³ (a number of 29 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1650051721.

It is not a weakly prime, because it can be changed into another prime (1650051727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 825025860 + 825025861.

It is an arithmetic number, because the mean of its divisors is an integer number (825025861).

Almost surely, 2^1650051721 is an apocalyptic number.

It is an amenable number.

1650051721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1650051721 is an equidigital number, since it uses as much as digits as its factorization.

1650051721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2100, while the sum is 28.

The square root of 1650051721 is about 40620.8286596913. The cubic root of 1650051721 is about 1181.6780971939.

The spelling of 1650051721 in words is "one billion, six hundred fifty million, fifty-one thousand, seven hundred twenty-one".