651869 has 2 divisors, whose sum is σ = 651870. Its totient is φ = 651868.

The previous prime is 651863. The next prime is 651877. The reversal of 651869 is 968156.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 648025 + 3844 = 805^2 + 62^2 .

It is a cyclic number.

It is not a de Polignac number, because 651869 - 2⁴ = 651853 is a prime.

It is a super-2 number, since 2×651869² = 849866386322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (651863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325934 + 325935.

It is an arithmetic number, because the mean of its divisors is an integer number (325935).

2⁶⁵¹⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

651869 is a deficient number, since it is larger than the sum of its proper divisors (1).

651869 is an equidigital number, since it uses as much as digits as its factorization.

651869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 35.

The square root of 651869 is about 807.3840474025. The cubic root of 651869 is about 86.7068567706.

The spelling of 651869 in words is "six hundred fifty-one thousand, eight hundred sixty-nine".