813971954 has 8 divisors (see below), whose sum is σ = 1253956908. Its totient is φ = 395986320.

The previous prime is 813971947. The next prime is 813971969. The reversal of 813971954 is 459179318.

It can be written as a sum of positive squares in 2 ways, for example, as 766016329 + 47955625 = 27677^2 + 6925^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 813971899 and 813971908.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5499737 + ... + 5499884.

Almost surely, 2^813971954 is an apocalyptic number.

813971954 is a deficient number, since it is larger than the sum of its proper divisors (439984954).

813971954 is a wasteful number, since it uses less digits than its factorization.

813971954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10999660.

The product of its digits is 272160, while the sum is 47.

The square root of 813971954 is about 28530.1937252448. The cubic root of 813971954 is about 933.6909451328.

The spelling of 813971954 in words is "eight hundred thirteen million, nine hundred seventy-one thousand, nine hundred fifty-four".