891478820254 has 16 divisors (see below), whose sum is σ = 1469919280896. Its totient is φ = 402124379800.

The previous prime is 891478820249. The next prime is 891478820329. The reversal of 891478820254 is 452028874198.

891478820254 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×891478820254² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154660342 + ... + 154666105.

It is an arithmetic number, because the mean of its divisors is an integer number (91869955056).

Almost surely, 2^891478820254 is an apocalyptic number.

891478820254 is a deficient number, since it is larger than the sum of its proper divisors (578440460642).

891478820254 is a wasteful number, since it uses less digits than its factorization.

891478820254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309326591.

The product of its (nonzero) digits is 10321920, while the sum is 58.

The spelling of 891478820254 in words is "eight hundred ninety-one billion, four hundred seventy-eight million, eight hundred twenty thousand, two hundred fifty-four".