1641535500 has 96 divisors (see below), whose sum is σ = 5214763008. Its totient is φ = 397944000.

The previous prime is 1641535481. The next prime is 1641535501. The reversal of 1641535500 is 55351461.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (1641535501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33244 + ... + 66243.

It is an arithmetic number, because the mean of its divisors is an integer number (54320448).

Almost surely, 2^1641535500 is an apocalyptic number.

1641535500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1641535500 is an abundant number, since it is smaller than the sum of its proper divisors (3573227508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1641535500 is a wasteful number, since it uses less digits than its factorization.

1641535500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99520 (or 99508 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 1641535500 is about 40515.8672620987. The cubic root of 1641535500 is about 1179.6416368439.

Adding to 1641535500 its reverse (55351461), we get a palindrome (1696886961).

It can be divided in two parts, 164153 and 5500, that added together give a triangular number (169653 = T₅₈₂).

The spelling of 1641535500 in words is "one billion, six hundred forty-one million, five hundred thirty-five thousand, five hundred".