813481642 has 4 divisors (see below), whose sum is σ = 1220222466. Its totient is φ = 406740820.

The previous prime is 813481631. The next prime is 813481663. The reversal of 813481642 is 246184318.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 598829841 + 214651801 = 24471^2 + 14651^2 .

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 as a sum of consecutive naturals, namely, 203370409 + ... + 203370412.

Almost surely, 2^813481642 is an apocalyptic number.

813481642 is a deficient number, since it is larger than the sum of its proper divisors (406740824).

813481642 is a wasteful number, since it uses less digits than its factorization.

813481642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406740823.

The product of its digits is 36864, while the sum is 37.

The square root of 813481642 is about 28521.5995694491. The cubic root of 813481642 is about 933.5034317814.

The spelling of 813481642 in words is "eight hundred thirteen million, four hundred eighty-one thousand, six hundred forty-two".