71425231 has 4 divisors (see below), whose sum is σ = 73888200. Its totient is φ = 68962264.

The previous prime is 71425229. The next prime is 71425267. The reversal of 71425231 is 13252417.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71425231 - 2¹ = 71425229 is a prime.

It is a super-2 number, since 2×71425231² = 10203127246806722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71425196 and 71425205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71425201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1231441 + ... + 1231498.

It is an arithmetic number, because the mean of its divisors is an integer number (18472050).

Almost surely, 2^71425231 is an apocalyptic number.

71425231 is a deficient number, since it is larger than the sum of its proper divisors (2462969).

71425231 is a wasteful number, since it uses less digits than its factorization.

71425231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2462968.

The product of its digits is 1680, while the sum is 25.

The square root of 71425231 is about 8451.3449225552. The cubic root of 71425231 is about 414.9067986377.

Adding to 71425231 its reverse (13252417), we get a palindrome (84677648).

The spelling of 71425231 in words is "seventy-one million, four hundred twenty-five thousand, two hundred thirty-one".