1984751961 has 8 divisors (see below), whose sum is σ = 2647580544. Its totient is φ = 1322545680.

The previous prime is 1984751953. The next prime is 1984751969. The reversal of 1984751961 is 1691574891.

It is an interprime number because it is at equal distance from previous prime (1984751953) and next prime (1984751969).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1984751961 - 2³ = 1984751953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1984751969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148081 + ... + 160926.

It is an arithmetic number, because the mean of its divisors is an integer number (330947568).

Almost surely, 2^1984751961 is an apocalyptic number.

It is an amenable number.

1984751961 is a deficient number, since it is larger than the sum of its proper divisors (662828583).

1984751961 is a wasteful number, since it uses less digits than its factorization.

1984751961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311151.

The product of its digits is 544320, while the sum is 51.

The square root of 1984751961 is about 44550.5551143866. Note that the first 3 decimals coincide. The cubic root of 1984751961 is about 1256.7109906182.

The spelling of 1984751961 in words is "one billion, nine hundred eighty-four million, seven hundred fifty-one thousand, nine hundred sixty-one".