3921521477 has 4 divisors (see below), whose sum is σ = 3921793260. Its totient is φ = 3921249696.

The previous prime is 3921521441. The next prime is 3921521497. The reversal of 3921521477 is 7741251293.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3142050916 + 779470561 = 56054^2 + 27919^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3921521477 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 (3921521407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112958 + ... + 143535.

It is an arithmetic number, because the mean of its divisors is an integer number (980448315).

Almost surely, 2^3921521477 is an apocalyptic number.

It is an amenable number.

3921521477 is a deficient number, since it is larger than the sum of its proper divisors (271783).

3921521477 is a wasteful number, since it uses less digits than its factorization.

3921521477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271782.

The product of its digits is 105840, while the sum is 41.

The square root of 3921521477 is about 62622.0526412222. The cubic root of 3921521477 is about 1576.9510015018.

The spelling of 3921521477 in words is "three billion, nine hundred twenty-one million, five hundred twenty-one thousand, four hundred seventy-seven".