813557542 has 72 divisors (see below), whose sum is σ = 1566422064. Its totient is φ = 310328064.

The previous prime is 813557531. The next prime is 813557557. The reversal of 813557542 is 245755318.

It is a junction number, because it is equal to n+sod(n) for n = 813557495 and 813557504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1460328 + ... + 1460884.

It is an arithmetic number, because the mean of its divisors is an integer number (21755862).

Almost surely, 2^813557542 is an apocalyptic number.

813557542 is a deficient number, since it is larger than the sum of its proper divisors (752864522).

813557542 is a wasteful number, since it uses less digits than its factorization.

813557542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638 (or 602 counting only the distinct ones).

The product of its digits is 168000, while the sum is 40.

The square root of 813557542 is about 28522.9301089492. The cubic root of 813557542 is about 933.5324636625.

The spelling of 813557542 in words is "eight hundred thirteen million, five hundred fifty-seven thousand, five hundred forty-two".