3877451681 has 4 divisors (see below), whose sum is σ = 4105537092. Its totient is φ = 3649366272.

The previous prime is 3877451629. The next prime is 3877451687. The reversal of 3877451681 is 1861547783.

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 3216704656 + 660747025 = 56716^2 + 25705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3877451681 is a prime.

It is a super-2 number, since 2×3877451681² = 30069263076979451522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3877451687) 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, 114042680 + ... + 114042713.

It is an arithmetic number, because the mean of its divisors is an integer number (1026384273).

Almost surely, 2^3877451681 is an apocalyptic number.

It is an amenable number.

3877451681 is a deficient number, since it is larger than the sum of its proper divisors (228085411).

3877451681 is a wasteful number, since it uses less digits than its factorization.

3877451681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228085410.

The product of its digits is 1128960, while the sum is 50.

The square root of 3877451681 is about 62269.1872518022. The cubic root of 3877451681 is about 1571.0215106933.

The spelling of 3877451681 in words is "three billion, eight hundred seventy-seven million, four hundred fifty-one thousand, six hundred eighty-one".