1200399901 has 2 divisors, whose sum is σ = 1200399902. Its totient is φ = 1200399900.

The previous prime is 1200399883. The next prime is 1200399947. The reversal of 1200399901 is 1099930021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 727380900 + 473019001 = 26970^2 + 21749^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200399901 - 2²⁵ = 1166845469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200199901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600199950 + 600199951.

It is an arithmetic number, because the mean of its divisors is an integer number (600199951).

Almost surely, 2^1200399901 is an apocalyptic number.

It is an amenable number.

1200399901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200399901 is an equidigital number, since it uses as much as digits as its factorization.

1200399901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 1200399901 is about 34646.7877443205. The cubic root of 1200399901 is about 1062.7766000235.

The spelling of 1200399901 in words is "one billion, two hundred million, three hundred ninety-nine thousand, nine hundred one".