813894749 has 2 divisors, whose sum is σ = 813894750. Its totient is φ = 813894748.

The previous prime is 813894691. The next prime is 813894821. The reversal of 813894749 is 947498318.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 771839524 + 42055225 = 27782^2 + 6485^2 .

It is a cyclic number.

It is not a de Polignac number, because 813894749 - 2²⁴ = 797117533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 813894749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (813894349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406947374 + 406947375.

It is an arithmetic number, because the mean of its divisors is an integer number (406947375).

Almost surely, 2^813894749 is an apocalyptic number.

It is an amenable number.

813894749 is a deficient number, since it is larger than the sum of its proper divisors (1).

813894749 is an equidigital number, since it uses as much as digits as its factorization.

813894749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 53.

The square root of 813894749 is about 28528.8406529252. The cubic root of 813894749 is about 933.6614240957.

The spelling of 813894749 in words is "eight hundred thirteen million, eight hundred ninety-four thousand, seven hundred forty-nine".