71732431 has 2 divisors, whose sum is σ = 71732432. Its totient is φ = 71732430.

The previous prime is 71732389. The next prime is 71732443. The reversal of 71732431 is 13423717.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71732431 - 2²³ = 63343823 is a prime.

It is a super-2 number, since 2×71732431² = 10291083314339522, which contains 22 as substring.

It is a Chen prime.

It is the 8470-th Hogben number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 71732431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71732491) by changing a digit.

It is a nontrivial repunit in base 8469.

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, 35866215 + 35866216.

It is an arithmetic number, because the mean of its divisors is an integer number (35866216).

Almost surely, 2^71732431 is an apocalyptic number.

71732431 is a deficient number, since it is larger than the sum of its proper divisors (1).

71732431 is an equidigital number, since it uses as much as digits as its factorization.

71732431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 28.

The square root of 71732431 is about 8469.5000442765. The cubic root of 71732431 is about 415.5007860744.

It can be divided in two parts, 7173 and 2431, that added together give a square (9604 = 98²).

The spelling of 71732431 in words is "seventy-one million, seven hundred thirty-two thousand, four hundred thirty-one".