1687690513 has 4 divisors (see below), whose sum is σ = 1687793008. Its totient is φ = 1687588020.

The previous prime is 1687690493. The next prime is 1687690541. The reversal of 1687690513 is 3150967861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1687690513 - 2¹⁷ = 1687559441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1687697513) 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, 20331 + ... + 61552.

It is an arithmetic number, because the mean of its divisors is an integer number (421948252).

Almost surely, 2^1687690513 is an apocalyptic number.

It is an amenable number.

1687690513 is a deficient number, since it is larger than the sum of its proper divisors (102495).

1687690513 is an equidigital number, since it uses as much as digits as its factorization.

1687690513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102494.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 1687690513 is about 41081.5105978346. The cubic root of 1687690513 is about 1190.5955903327.

It can be divided in two parts, 1687690 and 513, that added together give a triangular number (1688203 = T₁₈₃₇).

The spelling of 1687690513 in words is "one billion, six hundred eighty-seven million, six hundred ninety thousand, five hundred thirteen".