381364861 has 2 divisors, whose sum is σ = 381364862. Its totient is φ = 381364860.

The previous prime is 381364843. The next prime is 381364889. The reversal of 381364861 is 168463183.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 368448025 + 12916836 = 19195^2 + 3594^2 .

It is a cyclic number.

It is not a de Polignac number, because 381364861 - 2²⁷ = 247147133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381364261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190682430 + 190682431.

It is an arithmetic number, because the mean of its divisors is an integer number (190682431).

Almost surely, 2^381364861 is an apocalyptic number.

It is an amenable number.

381364861 is a deficient number, since it is larger than the sum of its proper divisors (1).

381364861 is an equidigital number, since it uses as much as digits as its factorization.

381364861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 40.

The square root of 381364861 is about 19528.5652570792. The cubic root of 381364861 is about 725.1817925412.

The spelling of 381364861 in words is "three hundred eighty-one million, three hundred sixty-four thousand, eight hundred sixty-one".