1641261500 has 24 divisors (see below), whose sum is σ = 3584516208. Its totient is φ = 656504400.

The previous prime is 1641261463. The next prime is 1641261509. The reversal of 1641261500 is 51621461.

It is a super-2 number, since 2×1641261500² = 5387478622764500000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1641261500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641261509) 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 7 ways as a sum of consecutive naturals, for example, 1640762 + ... + 1641761.

It is an arithmetic number, because the mean of its divisors is an integer number (149354842).

Almost surely, 2^1641261500 is an apocalyptic number.

1641261500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1641261500 is an abundant number, since it is smaller than the sum of its proper divisors (1943254708).

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

1641261500 is a wasteful number, since it uses less digits than its factorization.

1641261500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3282542 (or 3282530 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1641261500 is about 40512.4857297105. The cubic root of 1641261500 is about 1179.5759991541.

Adding to 1641261500 its reverse (51621461), we get a palindrome (1692882961).

The spelling of 1641261500 in words is "one billion, six hundred forty-one million, two hundred sixty-one thousand, five hundred".