653687987 has 2 divisors, whose sum is σ = 653687988. Its totient is φ = 653687986.

The previous prime is 653687977. The next prime is 653688011. The reversal of 653687987 is 789786356.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-653687987 is a prime.

It is a super-2 number, since 2×653687987² = 854615968696224338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (653687977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 326843993 + 326843994.

It is an arithmetic number, because the mean of its divisors is an integer number (326843994).

Almost surely, 2^653687987 is an apocalyptic number.

653687987 is a deficient number, since it is larger than the sum of its proper divisors (1).

653687987 is an equidigital number, since it uses as much as digits as its factorization.

653687987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15240960, while the sum is 59.

The square root of 653687987 is about 25567.3226404330. The cubic root of 653687987 is about 867.8743132978.

The spelling of 653687987 in words is "six hundred fifty-three million, six hundred eighty-seven thousand, nine hundred eighty-seven".