778952401 has 2 divisors, whose sum is σ = 778952402. Its totient is φ = 778952400.

The previous prime is 778952357. The next prime is 778952411. The reversal of 778952401 is 104259877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 775566801 + 3385600 = 27849^2 + 1840^2 .

It is a cyclic number.

It is not a de Polignac number, because 778952401 - 2²³ = 770563793 is a prime.

It is not a weakly prime, because it can be changed into another prime (778952411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389476200 + 389476201.

It is an arithmetic number, because the mean of its divisors is an integer number (389476201).

Almost surely, 2^778952401 is an apocalyptic number.

It is an amenable number.

778952401 is a deficient number, since it is larger than the sum of its proper divisors (1).

778952401 is an equidigital number, since it uses as much as digits as its factorization.

778952401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141120, while the sum is 43.

The square root of 778952401 is about 27909.7187553010. The cubic root of 778952401 is about 920.1041158948.

The spelling of 778952401 in words is "seven hundred seventy-eight million, nine hundred fifty-two thousand, four hundred one".