219611961 has 12 divisors (see below), whose sum is σ = 318642688. Its totient is φ = 145750104.

The previous prime is 219611957. The next prime is 219611989. The reversal of 219611961 is 169116912.

It is not a de Polignac number, because 219611961 - 2² = 219611957 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (219611911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52705 + ... + 56718.

Almost surely, 2^219611961 is an apocalyptic number.

It is an amenable number.

219611961 is a deficient number, since it is larger than the sum of its proper divisors (99030727).

219611961 is a wasteful number, since it uses less digits than its factorization.

219611961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109652 (or 109649 counting only the distinct ones).

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

The square root of 219611961 is about 14819.3104090575. The cubic root of 219611961 is about 603.3259378301.

The spelling of 219611961 in words is "two hundred nineteen million, six hundred eleven thousand, nine hundred sixty-one".