651625 has 16 divisors (see below), whose sum is σ = 877968. Its totient is φ = 480000.

The previous prime is 651617. The next prime is 651641. The reversal of 651625 is 526156.

It can be written as a sum of positive squares in 8 ways, for example, as 127449 + 524176 = 357^2 + 724^2 .

It is not a de Polignac number, because 651625 - 2³ = 651617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 651625.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1425 + ... + 1825.

It is an arithmetic number, because the mean of its divisors is an integer number (54873).

2⁶⁵¹⁶²⁵ is an apocalyptic number.

651625 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

651625 is a deficient number, since it is larger than the sum of its proper divisors (226343).

651625 is a wasteful number, since it uses less digits than its factorization.

651625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429 (or 419 counting only the distinct ones).

The product of its digits is 1800, while the sum is 25.

The square root of 651625 is about 807.2329279706. The cubic root of 651625 is about 86.6960370541.

It can be divided in two parts, 65 and 1625, that multiplied together give a square (105625 = 325²).

The spelling of 651625 in words is "six hundred fifty-one thousand, six hundred twenty-five".