161310878 has 4 divisors (see below), whose sum is σ = 241966320. Its totient is φ = 80655438.

The previous prime is 161310871. The next prime is 161310881. The reversal of 161310878 is 878013161.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×161310878² = 52042398722261768, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161310871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40327718 + ... + 40327721.

It is an arithmetic number, because the mean of its divisors is an integer number (60491580).

Almost surely, 2^161310878 is an apocalyptic number.

161310878 is a deficient number, since it is larger than the sum of its proper divisors (80655442).

161310878 is an equidigital number, since it uses as much as digits as its factorization.

161310878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80655441.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 161310878 is about 12700.8219419060. The cubic root of 161310878 is about 544.3621052799.

The spelling of 161310878 in words is "one hundred sixty-one million, three hundred ten thousand, eight hundred seventy-eight".