161211960 has 576 divisors, whose sum is σ = 709581600. Its totient is φ = 31352832.

The previous prime is 161211943. The next prime is 161211971. The reversal of 161211960 is 69112161.

161211960 is nontrivially palindromic in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 4357062 + ... + 4357098.

Almost surely, 2^161211960 is an apocalyptic number.

161211960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161211960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (354790800).

161211960 is an abundant number, since it is smaller than the sum of its proper divisors (548369640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161211960 is a wasteful number, since it uses less digits than its factorization.

161211960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100 (or 86 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 161211960 is about 12696.9271873158. The cubic root of 161211960 is about 544.2508124732.

It can be divided in two parts, 16121 and 1960, that added together give a palindrome (18081).

The spelling of 161211960 in words is "one hundred sixty-one million, two hundred eleven thousand, nine hundred sixty".