1641989625 has 96 divisors (see below), whose sum is σ = 2950147200. Its totient is φ = 810777600.

The previous prime is 1641989621. The next prime is 1641989627. The reversal of 1641989625 is 5269891461.

It is not a de Polignac number, because 1641989625 - 2² = 1641989621 is a prime.

It is a super-2 number, since 2×1641989625² = 5392259857215281250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (1641989621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 11812806 + ... + 11812944.

It is an arithmetic number, because the mean of its divisors is an integer number (30730700).

Almost surely, 2^1641989625 is an apocalyptic number.

1641989625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1641989625 is a deficient number, since it is larger than the sum of its proper divisors (1308157575).

1641989625 is a wasteful number, since it uses less digits than its factorization.

1641989625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300 (or 273 counting only the distinct ones).

The product of its digits is 933120, while the sum is 51.

The square root of 1641989625 is about 40521.4711603614. The cubic root of 1641989625 is about 1179.7504080454.

The spelling of 1641989625 in words is "one billion, six hundred forty-one million, nine hundred eighty-nine thousand, six hundred twenty-five".