381733561 has 4 divisors (see below), whose sum is σ = 416436624. Its totient is φ = 347030500.

The previous prime is 381733537. The next prime is 381733621. The reversal of 381733561 is 165337183.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 381733561 - 2¹⁵ = 381700793 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 381733561.

It is not an unprimeable number, because it can be changed into a prime (381733361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17351515 + ... + 17351536.

It is an arithmetic number, because the mean of its divisors is an integer number (104109156).

Almost surely, 2^381733561 is an apocalyptic number.

It is an amenable number.

381733561 is a deficient number, since it is larger than the sum of its proper divisors (34703063).

381733561 is a wasteful number, since it uses less digits than its factorization.

381733561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34703062.

The product of its digits is 45360, while the sum is 37.

The square root of 381733561 is about 19538.0029941650. The cubic root of 381733561 is about 725.4154169391.

The spelling of 381733561 in words is "three hundred eighty-one million, seven hundred thirty-three thousand, five hundred sixty-one".