161996211 has 24 divisors (see below), whose sum is σ = 253627920. Its totient is φ = 99043776.

The previous prime is 161996201. The next prime is 161996221. The reversal of 161996211 is 112699161.

161996211 is a `hidden beast` number, since 16 + 19 + 9 + 621 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (161996201) and next prime (161996221).

It is not a de Polignac number, because 161996211 - 2¹¹ = 161994163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161996201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13960 + ... + 22778.

It is an arithmetic number, because the mean of its divisors is an integer number (10567830).

Almost surely, 2^161996211 is an apocalyptic number.

161996211 is a deficient number, since it is larger than the sum of its proper divisors (91631709).

161996211 is a wasteful number, since it uses less digits than its factorization.

161996211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8995 (or 8992 counting only the distinct ones).

The product of its digits is 5832, while the sum is 36.

The square root of 161996211 is about 12727.7732145101. The cubic root of 161996211 is about 545.1319277733.

The spelling of 161996211 in words is "one hundred sixty-one million, nine hundred ninety-six thousand, two hundred eleven".