3821156549 has 4 divisors (see below), whose sum is σ = 4367036064. Its totient is φ = 3275277036.

The previous prime is 3821156509. The next prime is 3821156561. The reversal of 3821156549 is 9456511283.

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 3821156549 - 2²⁴ = 3804379333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3821156509) 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, 272939747 + ... + 272939760.

It is an arithmetic number, because the mean of its divisors is an integer number (1091759016).

Almost surely, 2^3821156549 is an apocalyptic number.

It is an amenable number.

3821156549 is a deficient number, since it is larger than the sum of its proper divisors (545879515).

3821156549 is an equidigital number, since it uses as much as digits as its factorization.

3821156549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545879514.

The product of its digits is 259200, while the sum is 44.

The square root of 3821156549 is about 61815.5041150681. The cubic root of 3821156549 is about 1563.3814101909.

The spelling of 3821156549 in words is "three billion, eight hundred twenty-one million, one hundred fifty-six thousand, five hundred forty-nine".