9999761 has 2 divisors, whose sum is σ = 9999762. Its totient is φ = 9999760.

The previous prime is 9999749. The next prime is 9999823. The reversal of 9999761 is 1679999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9985600 + 14161 = 3160^2 + 119^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9999761 is a prime.

It is a Chen prime.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (9999161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999880 + 4999881.

It is an arithmetic number, because the mean of its divisors is an integer number (4999881).

Almost surely, 2^9999761 is an apocalyptic number.

It is an amenable number.

9999761 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999761 is an equidigital number, since it uses as much as digits as its factorization.

9999761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 275562, while the sum is 50.

The square root of 9999761 is about 3162.2398707245. The cubic root of 9999761 is about 215.4417526232.

The spelling of 9999761 in words is "nine million, nine hundred ninety-nine thousand, seven hundred sixty-one".