71431357 has 2 divisors, whose sum is σ = 71431358. Its totient is φ = 71431356.

The previous prime is 71431343. The next prime is 71431361. The reversal of 71431357 is 75313417.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58079641 + 13351716 = 7621^2 + 3654^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71431357 is a prime.

It is a super-2 number, since 2×71431357² = 10204877525722898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71431397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35715678 + 35715679.

It is an arithmetic number, because the mean of its divisors is an integer number (35715679).

Almost surely, 2^71431357 is an apocalyptic number.

It is an amenable number.

71431357 is a deficient number, since it is larger than the sum of its proper divisors (1).

71431357 is an equidigital number, since it uses as much as digits as its factorization.

71431357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8820, while the sum is 31.

The square root of 71431357 is about 8451.7073423066. The cubic root of 71431357 is about 414.9186602089.

The spelling of 71431357 in words is "seventy-one million, four hundred thirty-one thousand, three hundred fifty-seven".