651138 has 16 divisors (see below), whose sum is σ = 1330560. Its totient is φ = 212336.

The previous prime is 651127. The next prime is 651139. The reversal of 651138 is 831156.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (651139) 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 in 7 ways as a sum of consecutive naturals, for example, 873 + ... + 1436.

It is an arithmetic number, because the mean of its divisors is an integer number (83160).

2⁶⁵¹¹³⁸ is an apocalyptic number.

651138 is an abundant number, since it is smaller than the sum of its proper divisors (679422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

651138 is a wasteful number, since it uses less digits than its factorization.

651138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2361.

The product of its digits is 720, while the sum is 24.

The square root of 651138 is about 806.9312238351. The cubic root of 651138 is about 86.6744338864.

The spelling of 651138 in words is "six hundred fifty-one thousand, one hundred thirty-eight".