378553913 has 2 divisors, whose sum is σ = 378553914. Its totient is φ = 378553912.

The previous prime is 378553843. The next prime is 378553939. The reversal of 378553913 is 319355873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 257377849 + 121176064 = 16043^2 + 11008^2 .

It is an emirp because it is prime and its reverse (319355873) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-378553913 is a prime.

It is a super-2 number, since 2×378553913² = 286606130095223138, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (378553963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189276956 + 189276957.

It is an arithmetic number, because the mean of its divisors is an integer number (189276957).

Almost surely, 2^378553913 is an apocalyptic number.

It is an amenable number.

378553913 is a deficient number, since it is larger than the sum of its proper divisors (1).

378553913 is an equidigital number, since it uses as much as digits as its factorization.

378553913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 340200, while the sum is 44.

The square root of 378553913 is about 19456.4619856746. The cubic root of 378553913 is about 723.3956838993.

The spelling of 378553913 in words is "three hundred seventy-eight million, five hundred fifty-three thousand, nine hundred thirteen".