1973081561 has 16 divisors (see below), whose sum is σ = 2200056768. Its totient is φ = 1754472000.

The previous prime is 1973081533. The next prime is 1973081563. The reversal of 1973081561 is 1651803791.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1973081561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1973081563) 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, 81515 + ... + 102911.

It is an arithmetic number, because the mean of its divisors is an integer number (137503548).

Almost surely, 2^1973081561 is an apocalyptic number.

1973081561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1973081561 is a deficient number, since it is larger than the sum of its proper divisors (226975207).

1973081561 is a wasteful number, since it uses less digits than its factorization.

1973081561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21592.

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 1973081561 is about 44419.3827174579. The cubic root of 1973081561 is about 1254.2429810736.

The spelling of 1973081561 in words is "one billion, nine hundred seventy-three million, eighty-one thousand, five hundred sixty-one".