1687992533 has 2 divisors, whose sum is σ = 1687992534. Its totient is φ = 1687992532.

The previous prime is 1687992491. The next prime is 1687992539. The reversal of 1687992533 is 3352997861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1616200804 + 71791729 = 40202^2 + 8473^2 .

It is an emirp because it is prime and its reverse (3352997861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1687992533 - 2⁶ = 1687992469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1687992539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843996266 + 843996267.

It is an arithmetic number, because the mean of its divisors is an integer number (843996267).

Almost surely, 2^1687992533 is an apocalyptic number.

It is an amenable number.

1687992533 is a deficient number, since it is larger than the sum of its proper divisors (1).

1687992533 is an equidigital number, since it uses as much as digits as its factorization.

1687992533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 53.

The square root of 1687992533 is about 41085.1862962796. The cubic root of 1687992533 is about 1190.6666069537. Note that the first 4 decimals are identical.

The spelling of 1687992533 in words is "one billion, six hundred eighty-seven million, nine hundred ninety-two thousand, five hundred thirty-three".