1996211961 has 24 divisors (see below), whose sum is σ = 3061618560. Its totient is φ = 1249001856.

The previous prime is 1996211957. The next prime is 1996211963. The reversal of 1996211961 is 1691126991.

1996211961 is a `hidden beast` number, since 1 + 9 + 9 + 621 + 19 + 6 + 1 = 666.

It is not a de Polignac number, because 1996211961 - 2² = 1996211957 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1996211963) 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, 36756 + ... + 73098.

It is an arithmetic number, because the mean of its divisors is an integer number (127567440).

Almost surely, 2^1996211961 is an apocalyptic number.

It is an amenable number.

1996211961 is a deficient number, since it is larger than the sum of its proper divisors (1065406599).

1996211961 is a wasteful number, since it uses less digits than its factorization.

1996211961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36725 (or 36722 counting only the distinct ones).

The product of its digits is 52488, while the sum is 45.

The square root of 1996211961 is about 44678.9879137834. The cubic root of 1996211961 is about 1259.1251088282.

The spelling of 1996211961 in words is "one billion, nine hundred ninety-six million, two hundred eleven thousand, nine hundred sixty-one".