19602520081 has 3 divisors (see below), whose sum is σ = 19602660091. Its totient is φ = 19602380072.

The previous prime is 19602520073. The next prime is 19602520121. The reversal of 19602520081 is 18002520691.

The square root of 19602520081 is 140009.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 10162454481 + 9440065600 = 100809^2 + 97160^2 .

It is not a de Polignac number, because 19602520081 - 2³ = 19602520073 is a prime.

It is a super-2 number, since 2×19602520081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19602520061) 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 2 ways as a sum of consecutive naturals, for example, 70005 + ... + 210013.

Almost surely, 2^19602520081 is an apocalyptic number.

19602520081 is the 140009-th square number.

19602520081 is the 70005-th centered octagonal number.

It is an amenable number.

19602520081 is a deficient number, since it is larger than the sum of its proper divisors (140010).

19602520081 is an frugal number, since it uses more digits than its factorization.

19602520081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280018 (or 140009 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The spelling of 19602520081 in words is "nineteen billion, six hundred two million, five hundred twenty thousand, eighty-one".