71533963 has 4 divisors (see below), whose sum is σ = 71688928. Its totient is φ = 71379000.

The previous prime is 71533961. The next prime is 71533967. The reversal of 71533963 is 36933517.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36933517 = 43 ⋅858919.

It is a cyclic number.

It is not a de Polignac number, because 71533963 - 2¹ = 71533961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71533961) 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 in 3 ways as a sum of consecutive naturals, for example, 76788 + ... + 77713.

It is an arithmetic number, because the mean of its divisors is an integer number (17922232).

Almost surely, 2^71533963 is an apocalyptic number.

71533963 is a deficient number, since it is larger than the sum of its proper divisors (154965).

71533963 is a wasteful number, since it uses less digits than its factorization.

71533963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154964.

The product of its digits is 51030, while the sum is 37.

The square root of 71533963 is about 8457.7752985049. The cubic root of 71533963 is about 415.1172320857.

The spelling of 71533963 in words is "seventy-one million, five hundred thirty-three thousand, nine hundred sixty-three".