1021313806 has 4 divisors (see below), whose sum is σ = 1531970712. Its totient is φ = 510656902.

The previous prime is 1021313803. The next prime is 1021313831. The reversal of 1021313806 is 6083131201.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021313803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255328450 + ... + 255328453.

It is an arithmetic number, because the mean of its divisors is an integer number (382992678).

Almost surely, 2^1021313806 is an apocalyptic number.

1021313806 is a deficient number, since it is larger than the sum of its proper divisors (510656906).

1021313806 is an equidigital number, since it uses as much as digits as its factorization.

1021313806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510656905.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1021313806 is about 31958.0006571125. Note that the first 3 decimals coincide. The cubic root of 1021313806 is about 1007.0547159475.

The spelling of 1021313806 in words is "one billion, twenty-one million, three hundred thirteen thousand, eight hundred six".