71121031 has 2 divisors, whose sum is σ = 71121032. Its totient is φ = 71121030.

The previous prime is 71121023. The next prime is 71121049. The reversal of 71121031 is 13012117.

It is a weak prime.

It is an emirp because it is prime and its reverse (13012117) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71121031 - 2³ = 71121023 is a prime.

It is a super-2 number, since 2×71121031² = 10116402101005922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71120996 and 71121014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71121091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35560515 + 35560516.

It is an arithmetic number, because the mean of its divisors is an integer number (35560516).

Almost surely, 2^71121031 is an apocalyptic number.

71121031 is a deficient number, since it is larger than the sum of its proper divisors (1).

71121031 is an equidigital number, since it uses as much as digits as its factorization.

71121031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42, while the sum is 16.

The square root of 71121031 is about 8433.3285836614. The cubic root of 71121031 is about 414.3169311905.

Adding to 71121031 its reverse (13012117), we get a palindrome (84133148).

The spelling of 71121031 in words is "seventy-one million, one hundred twenty-one thousand, thirty-one".