161878311 has 48 divisors (see below), whose sum is σ = 288046080. Its totient is φ = 89495280.

The previous prime is 161878259. The next prime is 161878351. The reversal of 161878311 is 113878161.

It is a happy number.

161878311 is a `hidden beast` number, since 1 + 618 + 7 + 8 + 31 + 1 = 666.

It is not a de Polignac number, because 161878311 - 2¹³ = 161870119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161878351) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 39040 + ... + 42986.

It is an arithmetic number, because the mean of its divisors is an integer number (6000960).

Almost surely, 2^161878311 is an apocalyptic number.

161878311 is a deficient number, since it is larger than the sum of its proper divisors (126167769).

161878311 is a wasteful number, since it uses less digits than its factorization.

161878311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4001 (or 3988 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 161878311 is about 12723.1407679079. The cubic root of 161878311 is about 544.9996476164. Note that the first 3 decimals are identical.

The spelling of 161878311 in words is "one hundred sixty-one million, eight hundred seventy-eight thousand, three hundred eleven".