1687237887431 has 2 divisors, whose sum is σ = 1687237887432. Its totient is φ = 1687237887430.

The previous prime is 1687237887421. The next prime is 1687237887457. The reversal of 1687237887431 is 1347887327861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1687237887431 - 2⁶ = 1687237887367 is a prime.

It is a super-2 number, since 2×1687237887431² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1687237887421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843618943715 + 843618943716.

It is an arithmetic number, because the mean of its divisors is an integer number (843618943716).

Almost surely, 2^{1687237887431} is an apocalyptic number.

1687237887431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1687237887431 is an equidigital number, since it uses as much as digits as its factorization.

1687237887431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75866112, while the sum is 65.

The spelling of 1687237887431 in words is "one trillion, six hundred eighty-seven billion, two hundred thirty-seven million, eight hundred eighty-seven thousand, four hundred thirty-one".