651481 has 2 divisors, whose sum is σ = 651482. Its totient is φ = 651480.

The previous prime is 651473. The next prime is 651487. The reversal of 651481 is 184156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 549081 + 102400 = 741^2 + 320^2 .

It is a cyclic number.

It is not a de Polignac number, because 651481 - 2³ = 651473 is a prime.

It is a super-2 number, since 2×651481² = 848854986722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (651487) by changing a digit.

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 as a sum of consecutive naturals, namely, 325740 + 325741.

It is an arithmetic number, because the mean of its divisors is an integer number (325741).

2⁶⁵¹⁴⁸¹ is an apocalyptic number.

It is an amenable number.

651481 is a deficient number, since it is larger than the sum of its proper divisors (1).

651481 is an equidigital number, since it uses as much as digits as its factorization.

651481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 25.

The square root of 651481 is about 807.1437294559. The cubic root of 651481 is about 86.6896503803.

The spelling of 651481 in words is "six hundred fifty-one thousand, four hundred eighty-one".