1687170449 has 4 divisors (see below), whose sum is σ = 1695734964. Its totient is φ = 1678605936.

The previous prime is 1687170409. The next prime is 1687170467. The reversal of 1687170449 is 9440717861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9440717861 = 56167 ⋅168083.

It can be written as a sum of positive squares in 2 ways, for example, as 1485331600 + 201838849 = 38540^2 + 14207^2 .

It is a cyclic number.

It is not a de Polignac number, because 1687170449 - 2¹² = 1687166353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1687170409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4281962 + ... + 4282355.

It is an arithmetic number, because the mean of its divisors is an integer number (423933741).

Almost surely, 2^1687170449 is an apocalyptic number.

It is an amenable number.

1687170449 is a deficient number, since it is larger than the sum of its proper divisors (8564515).

1687170449 is an equidigital number, since it uses as much as digits as its factorization.

1687170449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8564514.

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 1687170449 is about 41075.1804499992. The cubic root of 1687170449 is about 1190.4732832485.

The spelling of 1687170449 in words is "one billion, six hundred eighty-seven million, one hundred seventy thousand, four hundred forty-nine".