71642819 has 2 divisors, whose sum is σ = 71642820. Its totient is φ = 71642818.

The previous prime is 71642807. The next prime is 71642821. The reversal of 71642819 is 91824617.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71642819 is a prime.

It is a super-2 number, since 2×71642819² = 10265387028533522, which contains 22 as substring.

Together with 71642821, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71642119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35821409 + 35821410.

It is an arithmetic number, because the mean of its divisors is an integer number (35821410).

Almost surely, 2^71642819 is an apocalyptic number.

71642819 is a deficient number, since it is larger than the sum of its proper divisors (1).

71642819 is an equidigital number, since it uses as much as digits as its factorization.

71642819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 38.

The square root of 71642819 is about 8464.2081141711. The cubic root of 71642819 is about 415.3276920194.

The spelling of 71642819 in words is "seventy-one million, six hundred forty-two thousand, eight hundred nineteen".