71854290391 has 4 divisors (see below), whose sum is σ = 77381543512. Its totient is φ = 66327037272.

The previous prime is 71854290377. The next prime is 71854290491. The reversal of 71854290391 is 19309245817.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71854290391 - 2⁵ = 71854290359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71854290311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2763626541 + ... + 2763626566.

It is an arithmetic number, because the mean of its divisors is an integer number (19345385878).

Almost surely, 2^71854290391 is an apocalyptic number.

71854290391 is a deficient number, since it is larger than the sum of its proper divisors (5527253121).

71854290391 is a wasteful number, since it uses less digits than its factorization.

71854290391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5527253120.

The product of its (nonzero) digits is 544320, while the sum is 49.

The spelling of 71854290391 in words is "seventy-one billion, eight hundred fifty-four million, two hundred ninety thousand, three hundred ninety-one".