381281266 has 4 divisors (see below), whose sum is σ = 571921902. Its totient is φ = 190640632.

The previous prime is 381281261. The next prime is 381281269. The reversal of 381281266 is 662182183.

It is a happy number.

381281266 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 253478241 + 127803025 = 15921^2 + 11305^2 .

It is not an unprimeable number, because it can be changed into a prime (381281261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95320315 + ... + 95320318.

Almost surely, 2^381281266 is an apocalyptic number.

381281266 is a deficient number, since it is larger than the sum of its proper divisors (190640636).

381281266 is a wasteful number, since it uses less digits than its factorization.

381281266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190640635.

The product of its digits is 27648, while the sum is 37.

The square root of 381281266 is about 19526.4248135699. The cubic root of 381281266 is about 725.1288021654.

It can be divided in two parts, 3812 and 81266, that added together give a triangular number (85078 = T₄₁₂).

The spelling of 381281266 in words is "three hundred eighty-one million, two hundred eighty-one thousand, two hundred sixty-six".