1651661629 has 2 divisors, whose sum is σ = 1651661630. Its totient is φ = 1651661628.

The previous prime is 1651661597. The next prime is 1651661633. The reversal of 1651661629 is 9261661561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1642113529 + 9548100 = 40523^2 + 3090^2 .

It is a cyclic number.

It is not a de Polignac number, because 1651661629 - 2⁵ = 1651661597 is a prime.

It is a super-2 number, since 2×1651661629² = 5455972273421867282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1651661029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 825830814 + 825830815.

It is an arithmetic number, because the mean of its divisors is an integer number (825830815).

Almost surely, 2^1651661629 is an apocalyptic number.

It is an amenable number.

1651661629 is a deficient number, since it is larger than the sum of its proper divisors (1).

1651661629 is an equidigital number, since it uses as much as digits as its factorization.

1651661629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 43.

The square root of 1651661629 is about 40640.6401155297. The cubic root of 1651661629 is about 1182.0622820510.

The spelling of 1651661629 in words is "one billion, six hundred fifty-one million, six hundred sixty-one thousand, six hundred twenty-nine".