99997901 has 2 divisors, whose sum is σ = 99997902. Its totient is φ = 99997900.

The previous prime is 99997897. The next prime is 99997907. The reversal of 99997901 is 10979999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64416676 + 35581225 = 8026^2 + 5965^2 .

It is a cyclic number.

It is not a de Polignac number, because 99997901 - 2² = 99997897 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99997907) 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 as a sum of consecutive naturals, namely, 49998950 + 49998951.

It is an arithmetic number, because the mean of its divisors is an integer number (49998951).

Almost surely, 2^99997901 is an apocalyptic number.

It is an amenable number.

99997901 is a deficient number, since it is larger than the sum of its proper divisors (1).

99997901 is an equidigital number, since it uses as much as digits as its factorization.

99997901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 413343, while the sum is 53.

The square root of 99997901 is about 9999.8950494493. The cubic root of 99997901 is about 464.1556357736.

The spelling of 99997901 in words is "ninety-nine million, nine hundred ninety-seven thousand, nine hundred one".