291421853986 has 8 divisors (see below), whose sum is σ = 437772801744. Its totient is φ = 145497586740.

The previous prime is 291421853971. The next prime is 291421854029. The reversal of 291421853986 is 689358124192.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 291421853986.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106668420 + ... + 106671151.

It is an arithmetic number, because the mean of its divisors is an integer number (54721600218).

Almost surely, 2^291421853986 is an apocalyptic number.

291421853986 is a deficient number, since it is larger than the sum of its proper divisors (146350947758).

291421853986 is a wasteful number, since it uses less digits than its factorization.

291421853986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213340256.

The product of its digits is 7464960, while the sum is 58.

The spelling of 291421853986 in words is "two hundred ninety-one billion, four hundred twenty-one million, eight hundred fifty-three thousand, nine hundred eighty-six".