1006621651 has 24 divisors (see below), whose sum is σ = 1188009504. Its totient is φ = 852835200.

The previous prime is 1006621591. The next prime is 1006621699. The reversal of 1006621651 is 1561266001.

It is not a de Polignac number, because 1006621651 - 2¹⁷ = 1006490579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1006621351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1697211 + ... + 1697803.

It is an arithmetic number, because the mean of its divisors is an integer number (49500396).

Almost surely, 2^1006621651 is an apocalyptic number.

1006621651 is a deficient number, since it is larger than the sum of its proper divisors (181387853).

1006621651 is an frugal number, since it uses more digits than its factorization.

1006621651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729 (or 701 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1006621651 is about 31727.3013507295. The cubic root of 1006621651 is about 1002.2023630363.

Adding to 1006621651 its reverse (1561266001), we get a palindrome (2567887652).

The spelling of 1006621651 in words is "one billion, six million, six hundred twenty-one thousand, six hundred fifty-one".