9939997901 has 2 divisors, whose sum is σ = 9939997902. Its totient is φ = 9939997900.

The previous prime is 9939997891. The next prime is 9939997931. The reversal of 9939997901 is 1097999399.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8709742276 + 1230255625 = 93326^2 + 35075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9939997901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9939997931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4969998950 + 4969998951.

It is an arithmetic number, because the mean of its divisors is an integer number (4969998951).

Almost surely, 2^9939997901 is an apocalyptic number.

It is an amenable number.

9939997901 is a deficient number, since it is larger than the sum of its proper divisors (1).

9939997901 is an equidigital number, since it uses as much as digits as its factorization.

9939997901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11160261, while the sum is 65.

The square root of 9939997901 is about 99699.5381182882. The cubic root of 9939997901 is about 2150.1170227272.

The spelling of 9939997901 in words is "nine billion, nine hundred thirty-nine million, nine hundred ninety-seven thousand, nine hundred one".