515651 has 2 divisors, whose sum is σ = 515652. Its totient is φ = 515650.

The previous prime is 515639. The next prime is 515653. The reversal of 515651 is 156515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 515651 - 2⁶ = 515587 is a prime.

Together with 515653, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (515653) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 257825 + 257826.

It is an arithmetic number, because the mean of its divisors is an integer number (257826).

2⁵¹⁵⁶⁵¹ is an apocalyptic number.

515651 is a deficient number, since it is larger than the sum of its proper divisors (1).

515651 is an equidigital number, since it uses as much as digits as its factorization.

515651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 750, while the sum is 23.

The square root of 515651 is about 718.0884346653. The cubic root of 515651 is about 80.1897060396.

The spelling of 515651 in words is "five hundred fifteen thousand, six hundred fifty-one".