2009479961 has 2 divisors, whose sum is σ = 2009479962. Its totient is φ = 2009479960.

The previous prime is 2009479949. The next prime is 2009479963. The reversal of 2009479961 is 1699749002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1773673225 + 235806736 = 42115^2 + 15356^2 .

It is a cyclic number.

It is not a de Polignac number, because 2009479961 - 2⁶ = 2009479897 is a prime.

Together with 2009479963, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2009479963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1004739980 + 1004739981.

It is an arithmetic number, because the mean of its divisors is an integer number (1004739981).

Almost surely, 2^2009479961 is an apocalyptic number.

It is an amenable number.

2009479961 is a deficient number, since it is larger than the sum of its proper divisors (1).

2009479961 is an equidigital number, since it uses as much as digits as its factorization.

2009479961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 2009479961 is about 44827.2234362112. The cubic root of 2009479961 is about 1261.9085799795.

The spelling of 2009479961 in words is "two billion, nine million, four hundred seventy-nine thousand, nine hundred sixty-one".