3161861986 has 4 divisors (see below), whose sum is σ = 4742792982. Its totient is φ = 1580930992.

The previous prime is 3161861917. The next prime is 3161861987. The reversal of 3161861986 is 6891681613.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6891681613 = 23 ⋅299638331.

It can be written as a sum of positive squares in only one way, i.e., 1771989025 + 1389872961 = 42095^2 + 37281^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (3161861987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 790465495 + ... + 790465498.

Almost surely, 2^3161861986 is an apocalyptic number.

3161861986 is a deficient number, since it is larger than the sum of its proper divisors (1580930996).

3161861986 is a wasteful number, since it uses less digits than its factorization.

3161861986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580930995.

The product of its digits is 373248, while the sum is 49.

The square root of 3161861986 is about 56230.4364734972. The cubic root of 3161861986 is about 1467.7349518513.

The spelling of 3161861986 in words is "three billion, one hundred sixty-one million, eight hundred sixty-one thousand, nine hundred eighty-six".