3870009561 has 16 divisors (see below), whose sum is σ = 5781244608. Its totient is φ = 2282068800.

The previous prime is 3870009499. The next prime is 3870009587. The reversal of 3870009561 is 1659000783.

It is not a de Polignac number, because 3870009561 - 2⁶ = 3870009497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3870009061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1583550 + ... + 1585991.

It is an arithmetic number, because the mean of its divisors is an integer number (361327788).

Almost surely, 2^3870009561 is an apocalyptic number.

It is an amenable number.

3870009561 is a deficient number, since it is larger than the sum of its proper divisors (1911235047).

3870009561 is a wasteful number, since it uses less digits than its factorization.

3870009561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3169592.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 3870009561 is about 62209.4009053294. The cubic root of 3870009561 is about 1570.0157626178.

The spelling of 3870009561 in words is "three billion, eight hundred seventy million, nine thousand, five hundred sixty-one".