651401 has 2 divisors, whose sum is σ = 651402. Its totient is φ = 651400.

The previous prime is 651397. The next prime is 651437. The reversal of 651401 is 104156.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 491401 + 160000 = 701^2 + 400^2 .

It is a cyclic number.

It is not a de Polignac number, because 651401 - 2² = 651397 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 651401.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 651401.

It is not a weakly prime, because it can be changed into another prime (651461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325700 + 325701.

It is an arithmetic number, because the mean of its divisors is an integer number (325701).

2⁶⁵¹⁴⁰¹ is an apocalyptic number.

It is an amenable number.

651401 is a deficient number, since it is larger than the sum of its proper divisors (1).

651401 is an equidigital number, since it uses as much as digits as its factorization.

651401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 651401 is about 807.0941704659. The cubic root of 651401 is about 86.6861018215.

Adding to 651401 its reverse (104156), we get a palindrome (755557).

The spelling of 651401 in words is "six hundred fifty-one thousand, four hundred one".