71730731 has 2 divisors, whose sum is σ = 71730732. Its totient is φ = 71730730.

The previous prime is 71730727. The next prime is 71730739. The reversal of 71730731 is 13703717.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71730731 - 2² = 71730727 is a prime.

It is a super-2 number, since 2×71730731² = 10290595539588722, which contains 22 as substring.

It is equal to p_4213838 and since 71730731 and 4213838 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 = 71730694 and 71730703.

It is not a weakly prime, because it can be changed into another prime (71730739) 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 as a sum of consecutive naturals, namely, 35865365 + 35865366.

It is an arithmetic number, because the mean of its divisors is an integer number (35865366).

Almost surely, 2^71730731 is an apocalyptic number.

71730731 is a deficient number, since it is larger than the sum of its proper divisors (1).

71730731 is an equidigital number, since it uses as much as digits as its factorization.

71730731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3087, while the sum is 29.

The square root of 71730731 is about 8469.3996835667. The cubic root of 71730731 is about 415.4975037054.

The spelling of 71730731 in words is "seventy-one million, seven hundred thirty thousand, seven hundred thirty-one".