71838731 has 2 divisors, whose sum is σ = 71838732. Its totient is φ = 71838730.

The previous prime is 71838721. The next prime is 71838751. The reversal of 71838731 is 13783817.

It is a weak prime.

It is an emirp because it is prime and its reverse (13783817) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71838731 - 2¹⁴ = 71822347 is a prime.

It is a super-2 number, since 2×71838731² = 10321606543380722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71838721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35919365 + 35919366.

It is an arithmetic number, because the mean of its divisors is an integer number (35919366).

Almost surely, 2^71838731 is an apocalyptic number.

71838731 is a deficient number, since it is larger than the sum of its proper divisors (1).

71838731 is an equidigital number, since it uses as much as digits as its factorization.

71838731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 38.

The square root of 71838731 is about 8475.7731800704. The cubic root of 71838731 is about 415.7059277542.

The spelling of 71838731 in words is "seventy-one million, eight hundred thirty-eight thousand, seven hundred thirty-one".