813780001 has 2 divisors, whose sum is σ = 813780002. Its totient is φ = 813780000.

The previous prime is 813779969. The next prime is 813780017. The reversal of 813780001 is 100087318.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 535691025 + 278088976 = 23145^2 + 16676^2 .

It is a cyclic number.

It is not a de Polignac number, because 813780001 - 2⁵ = 813779969 is a prime.

It is not a weakly prime, because it can be changed into another prime (813780041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406890000 + 406890001.

It is an arithmetic number, because the mean of its divisors is an integer number (406890001).

Almost surely, 2^813780001 is an apocalyptic number.

It is an amenable number.

813780001 is a deficient number, since it is larger than the sum of its proper divisors (1).

813780001 is an equidigital number, since it uses as much as digits as its factorization.

813780001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 813780001 is about 28526.8294943550. The cubic root of 813780001 is about 933.6175442138.

The spelling of 813780001 in words is "eight hundred thirteen million, seven hundred eighty thousand, one".