381330261 has 20 divisors (see below), whose sum is σ = 613461772. Its totient is φ = 234664128.

The previous prime is 381330211. The next prime is 381330269. The reversal of 381330261 is 162033183.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 160807761 + 220522500 = 12681^2 + 14850^2 .

It is not a de Polignac number, because 381330261 - 2¹³ = 381322069 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381330269) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 180016 + ... + 182121.

Almost surely, 2^381330261 is an apocalyptic number.

It is an amenable number.

381330261 is a deficient number, since it is larger than the sum of its proper divisors (232131511).

381330261 is a wasteful number, since it uses less digits than its factorization.

381330261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362162 (or 362153 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 381330261 is about 19527.6793552127. The cubic root of 381330261 is about 725.1598607453.

The spelling of 381330261 in words is "three hundred eighty-one million, three hundred thirty thousand, two hundred sixty-one".