1687220061 has 8 divisors (see below), whose sum is σ = 2253263520. Its totient is φ = 1122994992.

The previous prime is 1687220057. The next prime is 1687220141. The reversal of 1687220061 is 1600227861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1687220061 - 2² = 1687220057 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1687220761) 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, 452430 + ... + 456143.

It is an arithmetic number, because the mean of its divisors is an integer number (281657940).

Almost surely, 2^1687220061 is an apocalyptic number.

It is an amenable number.

1687220061 is a deficient number, since it is larger than the sum of its proper divisors (566043459).

1687220061 is an equidigital number, since it uses as much as digits as its factorization.

1687220061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909195.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 1687220061 is about 41075.7843625657. The cubic root of 1687220061 is about 1190.4849519335.

The spelling of 1687220061 in words is "one billion, six hundred eighty-seven million, two hundred twenty thousand, sixty-one".