71453231 has 2 divisors, whose sum is σ = 71453232. Its totient is φ = 71453230.

The previous prime is 71453197. The next prime is 71453257. The reversal of 71453231 is 13235417.

It is an a-pointer prime, because the next prime (71453257) can be obtained adding 71453231 to its sum of digits (26).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71453231 is a prime.

It is a super-2 number, since 2×71453231² = 10211128440678722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71453231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71453131) 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, 35726615 + 35726616.

It is an arithmetic number, because the mean of its divisors is an integer number (35726616).

Almost surely, 2^71453231 is an apocalyptic number.

71453231 is a deficient number, since it is larger than the sum of its proper divisors (1).

71453231 is an equidigital number, since it uses as much as digits as its factorization.

71453231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 26.

The square root of 71453231 is about 8453.0013013130. The cubic root of 71453231 is about 414.9610085784.

Adding to 71453231 its reverse (13235417), we get a palindrome (84688648).

The spelling of 71453231 in words is "seventy-one million, four hundred fifty-three thousand, two hundred thirty-one".