161980311 has 8 divisors (see below), whose sum is σ = 219634560. Its totient is φ = 106156472.

The previous prime is 161980309. The next prime is 161980319. The reversal of 161980311 is 113089161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161980311 - 2¹ = 161980309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161980319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 457395 + ... + 457748.

It is an arithmetic number, because the mean of its divisors is an integer number (27454320).

Almost surely, 2^161980311 is an apocalyptic number.

161980311 is a deficient number, since it is larger than the sum of its proper divisors (57654249).

161980311 is an equidigital number, since it uses as much as digits as its factorization.

161980311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 915205.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 161980311 is about 12727.1485808880. The cubic root of 161980311 is about 545.1140922096.

The spelling of 161980311 in words is "one hundred sixty-one million, nine hundred eighty thousand, three hundred eleven".