71942231 has 2 divisors, whose sum is σ = 71942232. Its totient is φ = 71942230.

The previous prime is 71942209. The next prime is 71942237. The reversal of 71942231 is 13224917.

It is a strong prime.

It is an emirp because it is prime and its reverse (13224917) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71942231 is a prime.

It is a super-2 number, since 2×71942231² = 10351369202514722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71942194 and 71942203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71942237) 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, 35971115 + 35971116.

It is an arithmetic number, because the mean of its divisors is an integer number (35971116).

Almost surely, 2^71942231 is an apocalyptic number.

71942231 is a deficient number, since it is larger than the sum of its proper divisors (1).

71942231 is an equidigital number, since it uses as much as digits as its factorization.

71942231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 29.

The square root of 71942231 is about 8481.8766201826. The cubic root of 71942231 is about 415.9054715413.

The spelling of 71942231 in words is "seventy-one million, nine hundred forty-two thousand, two hundred thirty-one".