9902041081 has 9 divisors (see below), whose sum is σ = 9983200773. Its totient is φ = 9821538300.

The previous prime is 9902041067. The next prime is 9902041091. The reversal of 9902041081 is 1801402099.

The square root of 9902041081 is 99509.

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

It is not a de Polignac number, because 9902041081 - 2¹¹ = 9902039033 is a prime.

It is a super-2 number, since 2×9902041081² (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 (9902041021) 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 8 ways as a sum of consecutive naturals, for example, 15025530 + ... + 15026188.

Almost surely, 2^9902041081 is an apocalyptic number.

9902041081 is the 99509-th square number.

9902041081 is the 49755-th centered octagonal number.

It is an amenable number.

9902041081 is a deficient number, since it is larger than the sum of its proper divisors (81159692).

9902041081 is an frugal number, since it uses more digits than its factorization.

9902041081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1620 (or 810 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 34.

The cubic root of 9902041081 is about 2147.3767234803.

Multiplying 9902041081 by its product of nonzero digits (5184), we get a square (51332180963904 = 7164648²).

The spelling of 9902041081 in words is "nine billion, nine hundred two million, forty-one thousand, eighty-one".