71830031 has 32 divisors (see below), whose sum is σ = 91728000. Its totient is φ = 55883520.

The previous prime is 71830027. The next prime is 71830043. The reversal of 71830031 is 13003817.

It is a happy number.

It is not a de Polignac number, because 71830031 - 2² = 71830027 is a prime.

It is a super-2 number, since 2×71830031² = 10319106706921922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71829979 and 71830006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71830021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 396761 + ... + 396941.

It is an arithmetic number, because the mean of its divisors is an integer number (2866500).

Almost surely, 2^71830031 is an apocalyptic number.

71830031 is a deficient number, since it is larger than the sum of its proper divisors (19897969).

71830031 is a wasteful number, since it uses less digits than its factorization.

71830031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304 (or 290 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 71830031 is about 8475.2599370167. The cubic root of 71830031 is about 415.6891457782.

Adding to 71830031 its reverse (13003817), we get a palindrome (84833848).

The spelling of 71830031 in words is "seventy-one million, eight hundred thirty thousand, thirty-one".