71242519 has 2 divisors, whose sum is σ = 71242520. Its totient is φ = 71242518.

The previous prime is 71242517. The next prime is 71242601. The reversal of 71242519 is 91524217.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71242519 - 2¹ = 71242517 is a prime.

It is a super-2 number, since 2×71242519² = 10150993026930722, which contains 22 as substring.

Together with 71242517, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71242511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35621259 + 35621260.

It is an arithmetic number, because the mean of its divisors is an integer number (35621260).

Almost surely, 2^71242519 is an apocalyptic number.

71242519 is a deficient number, since it is larger than the sum of its proper divisors (1).

71242519 is an equidigital number, since it uses as much as digits as its factorization.

71242519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 31.

The square root of 71242519 is about 8440.5283602391. The cubic root of 71242519 is about 414.5527072169.

The spelling of 71242519 in words is "seventy-one million, two hundred forty-two thousand, five hundred nineteen".