491481389258 has 4 divisors (see below), whose sum is σ = 737222083890. Its totient is φ = 245740694628.

The previous prime is 491481389257. The next prime is 491481389297. The reversal of 491481389258 is 852983184194.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 852983184194 = 2 ⋅426491592097.

It can be written as a sum of positive squares in only one way, i.e., 407354127049 + 84127262209 = 638243^2 + 290047^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 491481389258.

It is not an unprimeable number, because it can be changed into a prime (491481389251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122870347313 + ... + 122870347316.

Almost surely, 2^491481389258 is an apocalyptic number.

491481389258 is a deficient number, since it is larger than the sum of its proper divisors (245740694632).

491481389258 is a wasteful number, since it uses less digits than its factorization.

491481389258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245740694631.

The product of its digits is 19906560, while the sum is 62.

The spelling of 491481389258 in words is "four hundred ninety-one billion, four hundred eighty-one million, three hundred eighty-nine thousand, two hundred fifty-eight".