651887 has 4 divisors (see below), whose sum is σ = 658320. Its totient is φ = 645456.

The previous prime is 651881. The next prime is 651901. The reversal of 651887 is 788156.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 651887 - 2¹⁰ = 650863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3062 + ... + 3267.

It is an arithmetic number, because the mean of its divisors is an integer number (164580).

2⁶⁵¹⁸⁸⁷ is an apocalyptic number.

651887 is a deficient number, since it is larger than the sum of its proper divisors (6433).

651887 is a wasteful number, since it uses less digits than its factorization.

651887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6432.

The product of its digits is 13440, while the sum is 35.

The square root of 651887 is about 807.3951944370. The cubic root of 651887 is about 86.7076548395.

The spelling of 651887 in words is "six hundred fifty-one thousand, eight hundred eighty-seven".