578402261 has 2 divisors, whose sum is σ = 578402262. Its totient is φ = 578402260.

The previous prime is 578402243. The next prime is 578402267. The reversal of 578402261 is 162204875.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 499299025 + 79103236 = 22345^2 + 8894^2 .

It is a cyclic number.

It is not a de Polignac number, because 578402261 - 2²⁶ = 511293397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (578402267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 289201130 + 289201131.

It is an arithmetic number, because the mean of its divisors is an integer number (289201131).

Almost surely, 2^578402261 is an apocalyptic number.

It is an amenable number.

578402261 is a deficient number, since it is larger than the sum of its proper divisors (1).

578402261 is an equidigital number, since it uses as much as digits as its factorization.

578402261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 578402261 is about 24049.9950311845. The cubic root of 578402261 is about 833.1886157052.

The spelling of 578402261 in words is "five hundred seventy-eight million, four hundred two thousand, two hundred sixty-one".