1651682621 has 2 divisors, whose sum is σ = 1651682622. Its totient is φ = 1651682620.

The previous prime is 1651682611. The next prime is 1651682677. The reversal of 1651682621 is 1262861561.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1599120121 + 52562500 = 39989^2 + 7250^2 .

It is a cyclic number.

It is not a de Polignac number, because 1651682621 - 2²² = 1647488317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1651682611) 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, 825841310 + 825841311.

It is an arithmetic number, because the mean of its divisors is an integer number (825841311).

Almost surely, 2^1651682621 is an apocalyptic number.

It is an amenable number.

1651682621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1651682621 is an equidigital number, since it uses as much as digits as its factorization.

1651682621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 38.

The square root of 1651682621 is about 40640.8983783577. The cubic root of 1651682621 is about 1182.0672898859.

The spelling of 1651682621 in words is "one billion, six hundred fifty-one million, six hundred eighty-two thousand, six hundred twenty-one".