9929491261 has 4 divisors (see below), whose sum is σ = 9954502972. Its totient is φ = 9904479552.

The previous prime is 9929491241. The next prime is 9929491267. The reversal of 9929491261 is 1621949299.

It is a happy number.

9929491261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7247287161 + 2682204100 = 85131^2 + 51790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9929491261 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9929491199 and 9929491208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9929491267) 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 3 ways as a sum of consecutive naturals, for example, 12505260 + ... + 12506053.

It is an arithmetic number, because the mean of its divisors is an integer number (2488625743).

Almost surely, 2^9929491261 is an apocalyptic number.

It is an amenable number.

9929491261 is a deficient number, since it is larger than the sum of its proper divisors (25011711).

9929491261 is a wasteful number, since it uses less digits than its factorization.

9929491261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25011710.

The product of its digits is 629856, while the sum is 52.

The square root of 9929491261 is about 99646.8326691822. The cubic root of 9929491261 is about 2149.3591932705.

The spelling of 9929491261 in words is "nine billion, nine hundred twenty-nine million, four hundred ninety-one thousand, two hundred sixty-one".