651131 has 4 divisors (see below), whose sum is σ = 701232. Its totient is φ = 601032.

The previous prime is 651127. The next prime is 651139. The reversal of 651131 is 131156.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 651131 - 2² = 651127 is a prime.

It is a super-2 number, since 2×651131² = 847943158322, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 651131.

It is not an unprimeable number, because it can be changed into a prime (651139) 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, 25031 + ... + 25056.

It is an arithmetic number, because the mean of its divisors is an integer number (175308).

2⁶⁵¹¹³¹ is an apocalyptic number.

651131 is a deficient number, since it is larger than the sum of its proper divisors (50101).

651131 is a wasteful number, since it uses less digits than its factorization.

651131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50100.

The product of its digits is 90, while the sum is 17.

The square root of 651131 is about 806.9268864030. The cubic root of 651131 is about 86.6741232901.

Adding to 651131 its reverse (131156), we get a palindrome (782287).

The spelling of 651131 in words is "six hundred fifty-one thousand, one hundred thirty-one".