651409 has 4 divisors (see below), whose sum is σ = 710640. Its totient is φ = 592180.

The previous prime is 651401. The next prime is 651437. The reversal of 651409 is 904156.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 651409 - 2³ = 651401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (651401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29599 + ... + 29620.

It is an arithmetic number, because the mean of its divisors is an integer number (177660).

2⁶⁵¹⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

651409 is a deficient number, since it is larger than the sum of its proper divisors (59231).

651409 is a wasteful number, since it uses less digits than its factorization.

651409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59230.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 651409 is about 807.0991265018. The cubic root of 651409 is about 86.6864566904.

It can be divided in two parts, 6 and 51409, that added together give a palindrome (51415).

The spelling of 651409 in words is "six hundred fifty-one thousand, four hundred nine".