381556049 has 4 divisors (see below), whose sum is σ = 436064064. Its totient is φ = 327048036.

The previous prime is 381556013. The next prime is 381556051. The reversal of 381556049 is 940655183.

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 not a de Polignac number, because 381556049 - 2²⁴ = 364778833 is a prime.

It is a super-3 number, since 3×381556049³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 381555997 and 381556015.

It is not an unprimeable number, because it can be changed into a prime (381556069) 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, 27253997 + ... + 27254010.

It is an arithmetic number, because the mean of its divisors is an integer number (109016016).

Almost surely, 2^381556049 is an apocalyptic number.

It is an amenable number.

381556049 is a deficient number, since it is larger than the sum of its proper divisors (54508015).

381556049 is an equidigital number, since it uses as much as digits as its factorization.

381556049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54508014.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 381556049 is about 19533.4597293977. The cubic root of 381556049 is about 725.3029563822.

The spelling of 381556049 in words is "three hundred eighty-one million, five hundred fifty-six thousand, forty-nine".