65173531 has 2 divisors, whose sum is σ = 65173532. Its totient is φ = 65173530.

The previous prime is 65173489. The next prime is 65173567. The reversal of 65173531 is 13537156.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65173531 - 2⁷ = 65173403 is a prime.

It is a super-2 number, since 2×65173531² = 8495178286015922, which contains 22 as substring.

It is equal to p_3850177 and since 65173531 and 3850177 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 65173493 and 65173502.

It is not a weakly prime, because it can be changed into another prime (65173571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32586765 + 32586766.

It is an arithmetic number, because the mean of its divisors is an integer number (32586766).

Almost surely, 2^65173531 is an apocalyptic number.

65173531 is a deficient number, since it is larger than the sum of its proper divisors (1).

65173531 is an equidigital number, since it uses as much as digits as its factorization.

65173531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9450, while the sum is 31.

The square root of 65173531 is about 8073.0125108289. The cubic root of 65173531 is about 402.4300633346.

The spelling of 65173531 in words is "sixty-five million, one hundred seventy-three thousand, five hundred thirty-one".