1641515551 has 16 divisors (see below), whose sum is σ = 1799273728. Its totient is φ = 1488326400.

The previous prime is 1641515549. The next prime is 1641515587. The reversal of 1641515551 is 1555151461.

It is a cyclic number.

It is not a de Polignac number, because 1641515551 - 2¹ = 1641515549 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 (1641515501) 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 in 15 ways as a sum of consecutive naturals, for example, 1046770 + ... + 1048336.

It is an arithmetic number, because the mean of its divisors is an integer number (112454608).

Almost surely, 2^1641515551 is an apocalyptic number.

1641515551 is a deficient number, since it is larger than the sum of its proper divisors (157758177).

1641515551 is a wasteful number, since it uses less digits than its factorization.

1641515551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2962.

The product of its digits is 15000, while the sum is 34.

The square root of 1641515551 is about 40515.6210738525. The cubic root of 1641515551 is about 1179.6368582355.

The spelling of 1641515551 in words is "one billion, six hundred forty-one million, five hundred fifteen thousand, five hundred fifty-one".