70531 has 4 divisors (see below), whose sum is σ = 71064. Its totient is φ = 70000.

The previous prime is 70529. The next prime is 70537. The reversal of 70531 is 13507.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 13507 = 13 ⋅1039.

It is a cyclic number.

It is not a de Polignac number, because 70531 - 2¹ = 70529 is a prime.

It is a super-2 number, since 2×70531² = 9949243922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (70537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111 + ... + 391.

It is an arithmetic number, because the mean of its divisors is an integer number (17766).

2⁷⁰⁵³¹ is an apocalyptic number.

70531 is a deficient number, since it is larger than the sum of its proper divisors (533).

70531 is a wasteful number, since it uses less digits than its factorization.

70531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532.

The product of its (nonzero) digits is 105, while the sum is 16.

The square root of 70531 is about 265.5767309084. The cubic root of 70531 is about 41.3168002440.

The spelling of 70531 in words is "seventy thousand, five hundred thirty-one".