1687161233 has 4 divisors (see below), whose sum is σ = 1687246308. Its totient is φ = 1687076160.

The previous prime is 1687161211. The next prime is 1687161239. The reversal of 1687161233 is 3321617861.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 381928849 + 1305232384 = 19543^2 + 36128^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1687161233 is a prime.

It is a super-2 number, since 2×1687161233² = 5693026052276160578, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1687161239) 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, 4685 + ... + 58277.

It is an arithmetic number, because the mean of its divisors is an integer number (421811577).

Almost surely, 2^1687161233 is an apocalyptic number.

It is an amenable number.

1687161233 is a deficient number, since it is larger than the sum of its proper divisors (85075).

1687161233 is an equidigital number, since it uses as much as digits as its factorization.

1687161233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85074.

The product of its digits is 36288, while the sum is 38.

The square root of 1687161233 is about 41075.0682653115. The cubic root of 1687161233 is about 1190.4711156308.

The spelling of 1687161233 in words is "one billion, six hundred eighty-seven million, one hundred sixty-one thousand, two hundred thirty-three".