1009909801 has 2 divisors, whose sum is σ = 1009909802. Its totient is φ = 1009909800.

The previous prime is 1009909799. The next prime is 1009909861. The reversal of 1009909801 is 1089099001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1008697600 + 1212201 = 31760^2 + 1101^2 .

It is an emirp because it is prime and its reverse (1089099001) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1086066001 and 1006606801.

It is a cyclic number.

It is not a de Polignac number, because 1009909801 - 2¹ = 1009909799 is a prime.

Together with 1009909799, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1009909861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 504954900 + 504954901.

It is an arithmetic number, because the mean of its divisors is an integer number (504954901).

Almost surely, 2^1009909801 is an apocalyptic number.

It is an amenable number.

1009909801 is a deficient number, since it is larger than the sum of its proper divisors (1).

1009909801 is an equidigital number, since it uses as much as digits as its factorization.

1009909801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 37.

The square root of 1009909801 is about 31779.0780388607. The cubic root of 1009909801 is about 1003.2924151062.

The spelling of 1009909801 in words is "one billion, nine million, nine hundred nine thousand, eight hundred one".