30851855491 has 4 divisors (see below), whose sum is σ = 30860601400. Its totient is φ = 30843109584.

The previous prime is 30851855471. The next prime is 30851855497. The reversal of 30851855491 is 19455815803.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19455815803 = 1109 ⋅17543567.

It is a cyclic number.

It is not a de Polignac number, because 30851855491 - 2³³ = 22261920899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30851855497) 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, 4367661 + ... + 4374718.

It is an arithmetic number, because the mean of its divisors is an integer number (7715150350).

Almost surely, 2^30851855491 is an apocalyptic number.

30851855491 is a deficient number, since it is larger than the sum of its proper divisors (8745909).

30851855491 is an equidigital number, since it uses as much as digits as its factorization.

30851855491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8745908.

The product of its (nonzero) digits is 864000, while the sum is 49.

The spelling of 30851855491 in words is "thirty billion, eight hundred fifty-one million, eight hundred fifty-five thousand, four hundred ninety-one".