1961088921 has 16 divisors (see below), whose sum is σ = 3169437120. Its totient is φ = 1188538560.

The previous prime is 1961088919. The next prime is 1961088931. The reversal of 1961088921 is 1298801691.

1961088921 is a `hidden beast` number, since 1 + 9 + 610 + 8 + 8 + 9 + 21 = 666.

It is not a de Polignac number, because 1961088921 - 2¹ = 1961088919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1961088901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3301200 + ... + 3301793.

It is an arithmetic number, because the mean of its divisors is an integer number (198089820).

Almost surely, 2^1961088921 is an apocalyptic number.

1961088921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1961088921 is a deficient number, since it is larger than the sum of its proper divisors (1208348199).

1961088921 is a wasteful number, since it uses less digits than its factorization.

1961088921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6603013 (or 6603007 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 45.

The square root of 1961088921 is about 44284.1836438248. The cubic root of 1961088921 is about 1251.6966658314.

The spelling of 1961088921 in words is "one billion, nine hundred sixty-one million, eighty-eight thousand, nine hundred twenty-one".