1641433551 has 16 divisors (see below), whose sum is σ = 2196933120. Its totient is φ = 1090121760.

The previous prime is 1641433511. The next prime is 1641433559. The reversal of 1641433551 is 1553341461.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1641433551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641433559) 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, 1341526 + ... + 1342748.

It is an arithmetic number, because the mean of its divisors is an integer number (137308320).

Almost surely, 2^1641433551 is an apocalyptic number.

1641433551 is a deficient number, since it is larger than the sum of its proper divisors (555499569).

1641433551 is a wasteful number, since it uses less digits than its factorization.

1641433551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2566.

The product of its digits is 21600, while the sum is 33.

The square root of 1641433551 is about 40514.6091058522. The cubic root of 1641433551 is about 1179.6172154460.

The spelling of 1641433551 in words is "one billion, six hundred forty-one million, four hundred thirty-three thousand, five hundred fifty-one".