1209072913 has 2 divisors, whose sum is σ = 1209072914. Its totient is φ = 1209072912.

The previous prime is 1209072911. The next prime is 1209072983. The reversal of 1209072913 is 3192709021.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 690007824 + 519065089 = 26268^2 + 22783^2 .

It is a cyclic number.

It is not a de Polignac number, because 1209072913 - 2¹ = 1209072911 is a prime.

Together with 1209072911, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1209072911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604536456 + 604536457.

It is an arithmetic number, because the mean of its divisors is an integer number (604536457).

Almost surely, 2^1209072913 is an apocalyptic number.

It is an amenable number.

1209072913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209072913 is an equidigital number, since it uses as much as digits as its factorization.

1209072913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 1209072913 is about 34771.7257696537. The cubic root of 1209072913 is about 1065.3300168230.

The spelling of 1209072913 in words is "one billion, two hundred nine million, seventy-two thousand, nine hundred thirteen".