388811261 has 2 divisors, whose sum is σ = 388811262. Its totient is φ = 388811260.

The previous prime is 388811257. The next prime is 388811273. The reversal of 388811261 is 162118883.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 387105625 + 1705636 = 19675^2 + 1306^2 .

It is an emirp because it is prime and its reverse (162118883) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 388811261 - 2² = 388811257 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 (388811221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194405630 + 194405631.

It is an arithmetic number, because the mean of its divisors is an integer number (194405631).

Almost surely, 2^388811261 is an apocalyptic number.

It is an amenable number.

388811261 is a deficient number, since it is larger than the sum of its proper divisors (1).

388811261 is an equidigital number, since it uses as much as digits as its factorization.

388811261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 38.

The square root of 388811261 is about 19718.2976192165. The cubic root of 388811261 is about 729.8712858696.

The spelling of 388811261 in words is "three hundred eighty-eight million, eight hundred eleven thousand, two hundred sixty-one".