1634541621 has 16 divisors (see below), whose sum is σ = 2275085184. Its totient is φ = 1041885504.

The previous prime is 1634541617. The next prime is 1634541641. The reversal of 1634541621 is 1261454361.

It is not a de Polignac number, because 1634541621 - 2² = 1634541617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1634541611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 297915 + ... + 303351.

It is an arithmetic number, because the mean of its divisors is an integer number (142192824).

Almost surely, 2^1634541621 is an apocalyptic number.

It is an amenable number.

1634541621 is a deficient number, since it is larger than the sum of its proper divisors (640543563).

1634541621 is a wasteful number, since it uses less digits than its factorization.

1634541621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9820.

The product of its digits is 17280, while the sum is 33.

The square root of 1634541621 is about 40429.4647627198. The cubic root of 1634541621 is about 1177.9639361708.

Adding to 1634541621 its reverse (1261454361), we get a palindrome (2895995982).

The spelling of 1634541621 in words is "one billion, six hundred thirty-four million, five hundred forty-one thousand, six hundred twenty-one".