3187672561 has 4 divisors (see below), whose sum is σ = 3197922624. Its totient is φ = 3177422500.

The previous prime is 3187672529. The next prime is 3187672573. The reversal of 3187672561 is 1652767813.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1652767813 = 3023 ⋅546731.

It is a cyclic number.

It is not a de Polignac number, because 3187672561 - 2⁵ = 3187672529 is a prime.

It is a super-2 number, since 2×3187672561² = 20322512712304597442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3187676561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5124565 + ... + 5125186.

It is an arithmetic number, because the mean of its divisors is an integer number (799480656).

Almost surely, 2^3187672561 is an apocalyptic number.

It is an amenable number.

3187672561 is a deficient number, since it is larger than the sum of its proper divisors (10250063).

3187672561 is a wasteful number, since it uses less digits than its factorization.

3187672561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10250062.

The product of its digits is 423360, while the sum is 46.

The square root of 3187672561 is about 56459.4771584010. The cubic root of 3187672561 is about 1471.7178862870.

The spelling of 3187672561 in words is "three billion, one hundred eighty-seven million, six hundred seventy-two thousand, five hundred sixty-one".