781426491 has 16 divisors (see below), whose sum is σ = 1062198144. Its totient is φ = 510895424.

The previous prime is 781426463. The next prime is 781426537. The reversal of 781426491 is 194624187.

It is a cyclic number.

It is not a de Polignac number, because 781426491 - 2⁷ = 781426363 is a prime.

It is a super-2 number, since 2×781426491² = 1221254721673146162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (781426411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22660 + ... + 45566.

It is an arithmetic number, because the mean of its divisors is an integer number (66387384).

Almost surely, 2^781426491 is an apocalyptic number.

781426491 is a deficient number, since it is larger than the sum of its proper divisors (280771653).

781426491 is a wasteful number, since it uses less digits than its factorization.

781426491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23130.

The product of its digits is 96768, while the sum is 42.

The square root of 781426491 is about 27954.0067074471. The cubic root of 781426491 is about 921.0772239345.

The spelling of 781426491 in words is "seven hundred eighty-one million, four hundred twenty-six thousand, four hundred ninety-one".