813561427 has 16 divisors (see below), whose sum is σ = 960786432. Its totient is φ = 674134560.

The previous prime is 813561403. The next prime is 813561449. The reversal of 813561427 is 724165318.

It is a cyclic number.

It is not a de Polignac number, because 813561427 - 2¹⁹ = 813037139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813561457) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 347553 + ... + 349885.

It is an arithmetic number, because the mean of its divisors is an integer number (60049152).

Almost surely, 2^813561427 is an apocalyptic number.

813561427 is a deficient number, since it is larger than the sum of its proper divisors (147225005).

813561427 is a wasteful number, since it uses less digits than its factorization.

813561427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3978.

The product of its digits is 40320, while the sum is 37.

The square root of 813561427 is about 28522.9982119692. The cubic root of 813561427 is about 933.5339496332.

The spelling of 813561427 in words is "eight hundred thirteen million, five hundred sixty-one thousand, four hundred twenty-seven".