813489407 has 2 divisors, whose sum is σ = 813489408. Its totient is φ = 813489406.

The previous prime is 813489379. The next prime is 813489409. The reversal of 813489407 is 704984318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 813489407 - 2¹⁰ = 813488383 is a prime.

Together with 813489409, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (813489409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406744703 + 406744704.

It is an arithmetic number, because the mean of its divisors is an integer number (406744704).

Almost surely, 2^813489407 is an apocalyptic number.

813489407 is a deficient number, since it is larger than the sum of its proper divisors (1).

813489407 is an equidigital number, since it uses as much as digits as its factorization.

813489407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 813489407 is about 28521.7356940282. The cubic root of 813489407 is about 933.5064019902.

The spelling of 813489407 in words is "eight hundred thirteen million, four hundred eighty-nine thousand, four hundred seven".