3870685261 has 4 divisors (see below), whose sum is σ = 3884659132. Its totient is φ = 3856711392.

The previous prime is 3870685243. The next prime is 3870685267. The reversal of 3870685261 is 1625860783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1625860783 = 251 ⋅6477533.

It can be written as a sum of positive squares in 2 ways, for example, as 615982761 + 3254702500 = 24819^2 + 57050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3870685261 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 (3870685267) 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, 6986520 + ... + 6987073.

It is an arithmetic number, because the mean of its divisors is an integer number (971164783).

Almost surely, 2^3870685261 is an apocalyptic number.

It is an amenable number.

3870685261 is a deficient number, since it is larger than the sum of its proper divisors (13973871).

3870685261 is a wasteful number, since it uses less digits than its factorization.

3870685261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13973870.

The product of its (nonzero) digits is 483840, while the sum is 46.

The square root of 3870685261 is about 62214.8315195018. The cubic root of 3870685261 is about 1570.1071317215.

The spelling of 3870685261 in words is "three billion, eight hundred seventy million, six hundred eighty-five thousand, two hundred sixty-one".