71427431 has 2 divisors, whose sum is σ = 71427432. Its totient is φ = 71427430.

The previous prime is 71427409. The next prime is 71427439. The reversal of 71427431 is 13472417.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71427431 is a prime.

It is a super-2 number, since 2×71427431² = 10203755798519522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71427394 and 71427403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71427439) by changing a digit.

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, 35713715 + 35713716.

It is an arithmetic number, because the mean of its divisors is an integer number (35713716).

Almost surely, 2^71427431 is an apocalyptic number.

71427431 is a deficient number, since it is larger than the sum of its proper divisors (1).

71427431 is an equidigital number, since it uses as much as digits as its factorization.

71427431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4704, while the sum is 29.

The square root of 71427431 is about 8451.4750783517. The cubic root of 71427431 is about 414.9110585030.

Adding to 71427431 its reverse (13472417), we get a palindrome (84899848).

The spelling of 71427431 in words is "seventy-one million, four hundred twenty-seven thousand, four hundred thirty-one".