381281265 has 24 divisors (see below), whose sum is σ = 695672640. Its totient is φ = 192646944.

The previous prime is 381281261. The next prime is 381281269. The reversal of 381281265 is 562182183.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (381281261) and next prime (381281269).

It is not a de Polignac number, because 381281265 - 2² = 381281261 is a prime.

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 in 23 ways as a sum of consecutive naturals, for example, 222117 + ... + 223826.

It is an arithmetic number, because the mean of its divisors is an integer number (28986360).

Almost surely, 2^381281265 is an apocalyptic number.

It is an amenable number.

381281265 is a deficient number, since it is larger than the sum of its proper divisors (314391375).

381281265 is a wasteful number, since it uses less digits than its factorization.

381281265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445973 (or 445970 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 381281265 is about 19526.4247879636. The cubic root of 381281265 is about 725.1288015315.

It can be divided in two parts, 38128 and 1265, that added together give a palindrome (39393).

The spelling of 381281265 in words is "three hundred eighty-one million, two hundred eighty-one thousand, two hundred sixty-five".