71873891 has 2 divisors, whose sum is σ = 71873892. Its totient is φ = 71873890.

The previous prime is 71873887. The next prime is 71873911. The reversal of 71873891 is 19837817.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71873891 - 2² = 71873887 is a prime.

It is not a weakly prime, because it can be changed into another prime (71873801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35936945 + 35936946.

It is an arithmetic number, because the mean of its divisors is an integer number (35936946).

Almost surely, 2^71873891 is an apocalyptic number.

71873891 is a deficient number, since it is larger than the sum of its proper divisors (1).

71873891 is an equidigital number, since it uses as much as digits as its factorization.

71873891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 44.

The square root of 71873891 is about 8477.8470734025. The cubic root of 71873891 is about 415.7737362855.

The spelling of 71873891 in words is "seventy-one million, eight hundred seventy-three thousand, eight hundred ninety-one".