671537 has 2 divisors, whose sum is σ = 671538. Its totient is φ = 671536.

The previous prime is 671533. The next prime is 671557. The reversal of 671537 is 735176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 579121 + 92416 = 761^2 + 304^2 .

It is a cyclic number.

It is not a de Polignac number, because 671537 - 2² = 671533 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 671537.

It is not a weakly prime, because it can be changed into another prime (671533) 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 as a sum of consecutive naturals, namely, 335768 + 335769.

It is an arithmetic number, because the mean of its divisors is an integer number (335769).

2⁶⁷¹⁵³⁷ is an apocalyptic number.

It is an amenable number.

671537 is a deficient number, since it is larger than the sum of its proper divisors (1).

671537 is an equidigital number, since it uses as much as digits as its factorization.

671537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4410, while the sum is 29.

The square root of 671537 is about 819.4736115336. The cubic root of 671537 is about 87.5702619324.

The spelling of 671537 in words is "six hundred seventy-one thousand, five hundred thirty-seven".